1. A system for facilitating management of health of subjects, comprising: at least one computer; at least one data storage device accessible by the at least one computer; and a plurality of electronic monitoring devices, the monitoring devices and the at least one computer communicating over a network; each monitoring device having associated therewith at least one sensor which provides to a respective monitoring device health-related information relating to a respective subject, a plurality of first monitoring devices having associated therewith a first type of sensor and a plurality of second monitoring devices having associated therewith a second type of sensor different from the first sensor type; each monitoring device comprising: at least one input device through use of which a message can be composed on the monitoring device; at least one display device that is capable of displaying messages composed on and received by the monitoring device; and identifying information associated therewith by which the respective monitoring device can be identified; the at least one data storage device storing a relationship of identifying information and sensor type for each of the plurality of monitoring devices; the at least one computer being configured to control routing of messages over the network at least between monitoring devices wherein the at least one computer is further configured to permit routing of messages between monitoring devices if respective stored relationships for the respective monitoring devices include the same type of sensor.