reference is made to fig1 a and 1b , which are simplified pictorial illustrations of a system for monitoring residents of a health care facility , constructed and operative in accordance with a preferred embodiment of the present invention . the system of fig1 a and 1b preferably comprises a plurality of tamper - resistant resident monitoring devices , each of the devices being uniquely associated with a resident of the facility , a multiplicity of device detectors operative to communicate with the monitoring devices and a computer subsystem operative to communicate with the plurality of tamper - resistant resident monitoring devices via the multiplicity of device detectors , and to thereby monitor the residents of the facility . it is appreciated that the monitoring devices of fig1 a & amp ; 1b are typically employed to monitor the whereabouts of residents of a health care facility , and may also be employed to monitor and report health - related parameters of the resident such as , for example , heart rate and blood oxygen levels . as shown in fig1 a , the system resides on a server 100 located at a nursing home 102 . server 100 is preferably connected to an enterprise - wide network 104 that connects between similar servers 106 located at other health care facilities which maybe managed jointly with nursing home 102 . a multiplicity of resident location detectors 110 are deployed throughout nursing home 102 , which detectors 110 communicate with a plurality of tamper - resistant resident monitoring devices 112 and with server 100 . devices 112 are typically worn by each of the residents of nursing home 102 , and preferably include a wristband 114 and a monitoring portion 116 . door controllers 120 are provided for controlling magnetic door locking mechanisms 122 which are associated with doors 124 of nursing home 102 . locking mechanisms 122 are preferably operative to lock or unlock doors 124 responsive to signals received from server 100 via door controllers 120 . as seen in fig1 a , a resident of nursing home 102 wearing a monitoring device 112 approaches a door 124 which he is not authorized to open . a location detector 110 communicating with device 112 ascertains that the resident is in the vicinity of door 124 and communicates the location of the resident to server 100 . server 100 ascertains that the resident is not authorized to exit door 124 , and therefore sends a signal to door controller 120 associated with door 124 instructing controller 120 to lock door 124 . as further shown in fig1 a , responsive to receiving the signal from server 100 , controller 120 employs locking mechanism 122 to lock door 124 , thereby preventing the resident from exiting door 124 . it is a particular feature of the present invention that wristband 114 is formed of an electrically conductive material such as , for example , kennelec 9719 , commercially available from kenner material & amp ; system co ., ltd . of jhongli city , taiwan . wristband 114 is preferably galvanically connected to monitoring portion 116 . therefore , any breach of wristband 114 or disconnecting of wristband 114 from monitoring portion 116 causes the opening of an electrical circuit and is thereby operative to cause device 112 to signal that it has been tampered with . turning now to fig1 b , it is shown that a resident of nursing home 102 tampers with a device 112 which is fastened to his wrist , and succeeds in removing device 112 from his wrist by disconnecting wristband 114 of device 112 from monitoring portion 116 . as seen in fig1 b , a detector 110 communicating with device 112 detects that device 112 has been tampered with , and sends a notification to server 100 notifying the system of the tampering . responsive to the notification , server 100 preferably sends a multiplicity of alarm notifications to the staff of nursing home 102 . as shown in fig1 b , the alarm notifications include , for example , a message which is sent to a computer 130 of a staff member of nursing home 102 , an alert which appears on a console 132 which is readily visible to staff members of nursing home 102 , and a text message which is sent to a mobile device 134 of a staff member of nursing home 102 . it is appreciated that the alerts may be , for example , any suitable combination of audio and visual alerts , and preferably include information pertaining to the identity of the resident and his last known location . additionally , server 100 preferably sends signals to door controllers 120 associated with all the doors 124 of nursing home 102 instructing controllers 120 to lock doors 124 and to thereby prevent unauthorized exit of the resident from nursing home 102 . reference is now made to fig2 , which is a simplified pictorial illustration of a system for monitoring whereabouts of residents of a health care facility , constructed and operative in accordance with another preferred embodiment of the present invention . the system of fig2 preferably includes a plurality of tamper - resistant resident monitoring devices , each of the devices being uniquely associated with a resident of the facility and a computer system operative to communicate with the multiplicity of monitoring devices , and to thereby monitor the whereabouts of the residents . as shown in fig2 , an emergency situation , such as a fire at a nursing home 200 forces residents 202 of nursing home 200 to evacuate nursing home 200 to an evacuation area outside of nursing home 200 . tamper - resistant resident monitoring devices 210 associated with each of residents 202 are preferably fastened to a wrist of each of residents 202 and preferably communicate resident whereabouts with a portable monitoring system 220 . communication between devices 210 and system 220 is typically of a wireless nature . it is a particular feature of this embodiment of the present invention that each of devices 210 located within a predefined range from system 220 is operative to communicate with system 220 and to notify system 220 of the presence of the resident 202 associated therewith within the predefined range . devices located outside of the predefined range from system 220 will fail to communicate with system 220 , and residents associated therewith are therefore marked by system 220 as being unaccounted for . in the example of fig2 , two residents of nursing home 200 are reported by system 220 as being unaccounted for . reference is now made to fig3 a and 3b , which are simplified pictorial illustrations of a system for monitoring whereabouts of residents of a health care facility , constructed and operative in accordance with a further preferred embodiment of the present invention . the system of fig3 a and 3b preferably comprises a plurality of tamper - resistant resident monitoring devices , each of the devices being uniquely associated with a resident of the facility , a multiplicity of resident location detectors operative to communicate with the monitoring devices , and a computer system operative to communicate with the multiplicity of resident location detectors , and to thereby monitor the residents of the facility . as shown in fig3 a , the system resides on a server 300 located at a nursing home 302 . server 300 is preferably connected to an enterprise - wide network 304 that connects between servers 306 located at other related health care facilities . a multiplicity of resident location detectors 310 are deployed throughout nursing home 302 , which detectors 310 communicate with a plurality of tamper - resistant resident monitoring devices 312 and with server 300 . devices 312 are typically worn by each of the residents of nursing home 302 . server 300 also preferably communicates with a central elevator control system of nursing home 302 , and is operative to thereby control elevator doors 322 of elevators 324 , in particular to prevent the closing of elevator doors 322 when a resident who requires accompaniment when riding an elevator 324 enters an elevator 324 without suitable accompaniment . as shown in fig3 a , a resident of a nursing home 302 wearing a monitoring device 312 enters an elevator 324 . a location detector 310 located inside elevator 324 and communicating with device 312 ascertains that the resident has entered elevator 324 and communicates the presence of the resident in elevator 324 to server 300 . server 300 ascertains that the resident is currently the sole occupant of elevator 324 and that he is not authorized to ride elevator 324 without suitable accompaniment . server 300 therefore sends a signal to the central elevator control system of nursing home 302 instructing the central elevator control system to prevent closure of elevator doors 322 . turning now to fig3 b , it is shown that a resident of nursing home 302 wearing a monitoring device 312 enters elevator 324 together with a member of the nursing home staff who is wearing an electronic tag 326 . a location detector 310 located in elevator 324 and communicating with device 312 ascertains that the resident has entered elevator 324 and communicates the presence of the resident in elevator 324 to server 300 . location detector 310 also ascertains that the staff member has entered elevator 324 and communicates the presence of the staff member to server 300 . server 300 ascertains that the resident is currently accompanied by the staff member and is therefore authorized to ride elevator 324 . server 300 therefore sends a signal to the central elevator control system of nursing home 302 instructing the central elevator control system to allow closure of elevator doors 322 . reference is now made to fig4 a , which is a simplified pictorial illustration of a tamper - resistant monitoring device which is part of the system of fig1 a - 3b . the tamper - resistant monitoring device is typically tamper - resistantly fastened about a wrist of an individual being monitored . as shown in fig4 a , a tamper - resistant monitoring device 400 comprises a monitoring portion 402 and first and second wristband elements 404 and 406 . a first end 410 of first wristband element 404 is tamper - resistantly connected to one end of monitoring portion 402 and a first end 412 of second wristband element 406 is tamper - resistantly connected to an opposite end of monitoring portion 402 . a buckle 420 is provided at a second end of second wristband element 406 for accommodating wristband element 404 . buckle pin 422 of buckle 420 is provided for insertion to a selectable one of apertures 426 formed in wristband element 404 , and is thereby operable for interlinking first and second wristband elements 404 and 406 . it is appreciated that the first and second wristband elements 404 and 406 are typically interlinked about the wrist of the individual being monitored . two tamper - resistant pins 430 are preferably provided for irremovable snap - in engagement with pin receiving element 432 . as shown in fig4 a , pins 430 are preferably interconnected by pin connecting element 434 located on an outer surface of wristband element 406 and preferably protrude through two pin apertures 436 formed in wristband element 406 to an inner surface of wristband element 406 . pins 430 are preferably inserted through two of apertures 426 of wristband element 404 upon insertion thereof through buckle 420 , and are then irremovably inserted into pin receiving element 432 . it is appreciated that the snap engagement of pins 430 with receiving element 432 via second and first wristband elements 406 and 404 provides a locking mechanism which is operative to lock wristband elements 404 and 406 together about a wrist of an individual . it is a particular feature of the present invention that wristband elements 404 and 406 are formed of an electrically conductive material such as , for example , kennelec 9719 , commercially available from kenner material & amp ; system co ., ltd . of jhongli city , taiwan , and are galvanically connected to monitoring portion 402 . therefore , breaching of wristband elements 404 and 406 , disconnecting either of wristband elements 404 and 406 from monitoring portion 402 , or disengagement of pins 430 from receiving element 432 causes the opening of an electrical circuit and is thereby operative to cause device 400 to signal that it has been tampered with . reference is now made to fig4 b , which is a simplified exploded view illustration of the tamper - resistant monitoring device 400 of fig4 a . as shown in fig4 b , monitoring portion 402 comprises interconnecting top and bottom housing elements 450 and 452 . housing elements 450 and 452 preferably houses a distress button 460 , a distress button circuit board 462 , a battery 464 , and a main circuit board 466 . spring rods 470 are preferably inserted through bores 472 formed in first and second wristband elements 404 and 406 and into recesses 474 formed in top housing element 450 , thereby interconnecting wristband elements 404 and 406 and top housing element 450 . protrusions 476 which are formed in wristband elements 404 and 406 are operative to retain bottom housing element 452 in tight engagement with top housing element 450 upon interconnecting wristband elements 404 and 406 with top housing element 450 using spring rods 470 . tamper - resistant battery mounting brackets 492 are provided for retaining battery 464 . each of brackets 492 are preferably formed with a resilient retaining flap 494 . reference is now made to fig4 c , which is a sectional illustration taken along lines ivc - ivc in fig4 a . as shown in fig4 c , tamper - resistant battery mounting brackets 492 are tightly inserted into recess 496 formed in housing portion 450 and into recesses 498 formed in wristband elements 404 and 406 . as seen in fig4 c , recesses 496 and 498 are at least partially mutually aligned . upon insertion into recesses 498 , resilient retaining flaps 494 of brackets 492 are preferably lodged into an upper portion of recesses 498 which portion is not aligned with recesses 496 , thereby preventing removal of brackets 492 from recesses 496 and 498 , and thereby tamper - resistantly locking wristband elements 404 and 406 to monitoring portion 402 . it is appreciated that brackets 492 provide a galvanic link between wristband elements 404 and 406 and monitoring portion 402 . it is a particular feature of the present invention that brackets 492 are lodged into recess 498 and are thereby tightly retained in wristband elements 404 and 406 . this feature is operative to guarantee that upon attempting to disconnect either of wristband elements 404 and 406 from monitoring portion 402 , at least one of flaps 494 will be torn from corresponding bracket 492 , thereby disconnecting the galvanic link between wristband elements 404 and 406 and monitoring portion 402 , and thereby opening an electrical circuit embodied therewithin . the opening of the electrical circuit is operative to create an electronic signal notifying of the disconnecting of either of wristband elements 404 and 406 . this electronic signal is then preferably transmitted by main circuit board 466 to an external monitoring receiver , such as location detectors 110 of fig1 a & amp ; 1b . reference is now made to fig5 a and 5b , which are simplified pictorial illustrations of the operation of the system of fig1 a - 4c in registering a new resident at a health care facility . the system preferably resides on a server 500 located at a nursing home 502 . server 500 is preferably connected to an enterprise - wide network 504 which preferably connects between servers 506 located at other related health care facilities . it is appreciated that the registration of a resident at the health care facility includes , inter alia , registering a monitoring device to the resident . it is imperative that each monitoring device be uniquely assigned to one particular resident . as shown in fig5 a , john , a new resident at nursing home 502 , is introduced to an administrator of nursing home 502 . the administrator initially records john &# 39 ; s personal details , such as john &# 39 ; s full name , date of birth , and an identification number on the system . the identification number may be any unique identification number , such as a u . s . social security number . as further shown in fig5 a , the administrator then selects a monitoring device 510 and attempts to register device 510 in the system by first pressing a registration button 512 on device 510 . a first registration signal is then emitted by device 510 and received by at least one of location detectors s 20 which are mounted throughout nursing home 502 and which are connected to the system residing on server 500 . turning now to fig5 b , it is shown that upon receiving the first registration signal , the system notifies the administrator that registration of a particular monitoring device having a particular serial number , such as # 6 , has been attempted . the administrator then reviews a device registration table 530 provided by the system to verify that device # 6 is not registered to any other resident of nursing home 502 or any other related health care facilities . upon verifying that device # 6 is available , the administrator assigns device # 6 to john by entering john &# 39 ; s personal details into table 530 . to complete the registration process of device 510 to john , the administrator once again presses registration button 512 on device 510 . a second registration signal is then emitted by device 510 and received by at least one of location detectors 520 which are mounted throughout nursing home 502 and which are connected to the system residing on server 500 . upon receiving the second registration signal , the system notifies the administrator that registration of monitoring device # 6 to john has been completed . it is a particular feature of the present invention that the registration process described hereinabove , by which the assignment of a monitoring device to a resident is coupled with physical registration signals that are emitted by the device and received by the system , is operative to guarantee that each monitoring device be uniquely assigned to one particular resident . it is appreciated that upon discharge of a resident from nursing home 502 , the resident &# 39 ; s details are deleted from table 530 , thereby making the device registered to the discharged resident available for reassignment to a new resident . reference is now made to fig6 , which is a simplified flowchart indicating steps in the execution of a method for uniquely registering a resident of a health care facility which employs the system of fig1 a - 4c . the method of fig6 preferably includes designating a tamper - resistant resident monitoring device to be associated with the resident , employing the device to send a first registration signal to a resident registration system , responsive to receiving the first registration signal , ascertaining that the device is not associated with a resident other than the resident , employing the resident registration system to associate the device with the resident and employing the device to send a second registration signal to the resident registration system . as shown in fig6 , upon initializing the registration process of a new resident in step 600 , the personal details of the new resident are typically entered into the system in step 602 . a monitoring device is then selected in step 604 to be registered to the new resident . to initiate the registration of the device to the new resident , a registration button on the selected device is pressed in step 606 , resulting in a first registration signal being emitted from the device and received by the system in step 608 . thereafter , in step 610 , it is verified that the device is not registered to any other resident . if the device is not registered to any other resident , the device is assigned to the new resident in step 612 . thereafter , in step 614 , the device registration button is pressed once again , resulting in a second registration signal being emitted from the device and received by the system in step 616 , thereby completing the registration of the device to the new resident in step 618 . it will be appreciated by persons skilled in the art that the present invention is not limited by what has been particularly shown and described hereinabove . rather the scope of the present invention includes both combinations and subcombinations of the various features described hereinabove as well as modifications thereof which would occur to persons skilled in the art upon reading the foregoing description and which are not in the prior art . while the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment , it is to be understood that the invention is not to be limited to the disclosed embodiment , but on the contrary , is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims .