referring to fig1 which shows an sst system 10 in the form of an atm system . atm system 10 comprises an atm network 12 connected to a server 14 via a public access network 16 in the form of the internet . the server 14 is connected to a database 18 for storing advertisements . the atm network 12 comprises a plurality of atms 20 ( four of which , 20 a , 20 b , 20 c , 20 d , are shown in fig1 ) interconnected to a financial institution &# 39 ; s authorization center 22 via a switching device 24 and a secure private network 26 in the form of an intranet . in a similar way as for conventional atm networks . the switching device 24 is used for routing financial transaction authorization requests from the atms 20 to the authorization center 22 . as will be appreciated by those of skill in the art , the switching device 24 and the authorization center 22 may be incorporated into a single server ( an authorization server ). it will also be appreciated that the switching device 24 is able to route authorization requests to authorization centers operated by other financial institutions and to financial services companies . reference is now made to fig2 which is a block diagram showing one of the atms 20 a and the server 14 of fig1 in more detail . atm 20 a operates as a client of server 14 and includes : a user interface 30 ; a network connection 32 providing a link to the server 14 via the internet 16 ; and a controller 34 for controlling the operation of the atm 20 a . the controller 34 incorporates an embedded web browser component 36 and an atm application 38 for controlling modules in the atm 20 a . the server 14 also has a network connection 40 and a controller 42 incorporating a web server 44 and a server operating system 46 for controlling the server 14 . referring to fig3 which shows atm 20 a in more detail , a system bus ( or a plurality of system buses ) 48 interconnects the network connection 32 and the controller 34 to allow mutual intercommunication , and also connects various modules within the controller 34 , as described below . the user interface 30 comprises the following user interface elements ( peripheral devices ): a card reader 50 , a display 52 , an encrypting keypad 54 , a printer 56 , and a cash dispenser 58 . the controller 34 comprises modules for driving the user interface elements 50 to 58 , namely : card reader controller 60 , display controller 62 , keypad controller 64 , printer controller 66 , and dispenser controller 68 . these user interface elements ( 50 to 58 ) and associated controllers ( 60 to 68 ) are standard modules that are used on conventional atms and will not be described in detail herein . the controller 34 also comprises a bios 70 stored in non - volatile memory , a microprocessor 72 , associated main memory 74 , storage space 76 in the form of a magnetic disk drive , and a dedicated switch connection 78 for connecting the atm 20 a to the authorization center 22 ( fig1 ). the embedded web browser component 36 is a hotjava ( trade mark ) browser bean component which is embedded within the atm application 38 . for simplicity , hereinafter the embedded browser component 36 will be referred to as a browser or a web browser . in use , the main memory 74 is loaded with the atm operating system kernel 80 , and the atm application 38 for controlling the operation of the atm 20 a . the atm application 38 includes the sequence of screens used in each transaction flow . the atm application 38 is configured so that each screen that is presented to a user during a “ dead time ” includes screen space that is allocated to the web browser 36 . “ dead times ” include , for example , when the atm 20 a requests authorization of a transaction , when the atm 20 a prints a receipt or a statement , or such like event . referring to fig4 which shows remote server 14 in more detail , a system bus ( or buses ) 90 connects the network connection 40 to the controller 42 . the controller 42 further comprises a bios 92 stored in non - volatile memory , a microprocessor 94 , associated main memory 96 , and storage space 98 in the form of a magnetic disk drive . the server operating system 46 and the web server 44 are stored on the magnetic drive 98 . in use , the main memory 96 is loaded with the server operating system kernel 102 and the web server 44 . in this embodiment the web server 44 is the java web server ( trade mark ). the java web server 44 includes a server application 104 for invoking two types of java servlets ( 104 a , 104 b ), and the server 44 supports a database application programming interface ( api ) 106 in the form of a jdbc ( java database connectivity ) api for accessing database 18 ( fig1 ). the java servlets 104 perform a number of different tasks , as will be described in more detail below . the java web server 44 also provides session management , thread management , administration and security features ; as is well known to those of skill in the art . the database application interface 106 is a database driver that provides sql access to the database 18 . the java servlets use the jdbc api 106 to obtain information from the database 18 for use in generating html files in response to a request from an atm 20 . a java servlet is software code that is used to generate information dynamically . each servlet must be registered with the web server so that the web server can distinguish between a request for a servlet and a request for a web page . when a registered servlet is requested by a remote web browser , the web server instantiates the servlet . once instantiated , the servlet remains in memory for a period of time awaiting further invocation by the web browser . when a third party ( such as a campaign manager for a particular product line ) wishes to rent advertising space on one or more of the atms 20 ( fig1 ) in atm network 12 , the financial institution that owns the atm network 12 ( fig1 ) creates an account for the third party and provides the campaign manager with a log - in facility ( which may include a username and a passcode ) to allow the campaign manager to access the server 14 . referring to fig5 the campaign manager can access the server 14 using a personal computer ( pc ) 110 having internet access . after logging - in to the server 14 , the campaign manager can enter a description of an advertisement comprising text data and / or image data and / or sound data for storing on the database 18 . the advertisement may include animation and / or still images . in this embodiment , the server 14 is configured for use by campaign managers who are not specialists at designing web pages . to assist these managers , the server 14 instantiates a series of servlets ( field servlets 104 a ). each field servlet 104 a presents the manager with a descriptive field for receiving an entry , as shown in fig6 . the first field shown in fig6 is a text field 112 which allows the manager to type in the text to be displayed as part of the advertisement . the second field 114 is a text color field , the third field 116 is a text font size field , the fourth field 118 is a background color field , the fifth field 120 is an image field , and the sixth field 122 is a sound file field . where there is a limited number of options available , for example fields 114 to 118 , a drop - down menu format is used to facilitate rapid selection by the manager . for field 114 , arrow 114 a presents the user with the various possibilities for selection ; in fig6 the “ green ” option is being selected for field entry 114 b . where a manager has previously composed an advertisement , the previous entries are added to the respective drop - down menus . thus , if a manager has previously used an image , then that image file is listed in the drop - down menu of field 120 . a manager may upload a plurality of images for use in a future advertisement . the server 14 may allow the user to enter formatting information so that the format of the advertisement can be chosen by the campaign manager . the field servlet associated with each field ( 114 to 122 ) translates the field entry into a format for generating html . the campaign manager is then prompted to enter display criteria that determine when and where the advertisement is shown . the display criteria include : ( 1 ) the atms 20 on which the advertisement is to be displayed , for example , atms 20 a and 20 c ; ( 2 ) the times at which the advertisement is to be displayed , for example , wednesday mornings between 10 and 11 . 30 am ; and / or ( 3 ) the number of transactions within a particular time period during which the advertisement is to be displayed , for example , not more than fifty transactions , every second transaction , or such like . the server 14 presents the manager with a calendar indicating the availability of atms 20 in the network 12 for displaying advertisements , to allow the manager to schedule display of the advertisement . the servlet for the text field 112 , the servlet for the image field 120 , and the servlet for the sound field 122 , each conveys its respective entry ( 112 b , 120 b , 122 b ) via email to an authorized person for screening . the authorized person may be an employee of the financial institution or a person contracted by the financial institution to screen proposed entries . when the authorized person approves the text , image , and sound entries ( 112 b , 120 b , 122 b ), the translated field entries of fields 112 to 122 are stored in a single entry in the database 18 . as will be described below , a database servlet ( 104 b ) is able to generate a web page from these translated field entries . at any time the campaign manager may log - in to the server 14 and change the advertisement ( by changing the field entries ) and / or the display criteria . any change to the advertisement that involves a new text entry ( 112 b ), image entry ( 120 b ), or sound entry ( 122 b ), results in the new entry or entries being conveyed to the authorized person for screening prior to being saved on the database 18 . an authorized person will not approve an entry if it does not meet an acceptance criterion . the acceptance criterion may be based on : ( 1 ) for a text or sound entry , the absence of certain keywords that are deemed offensive or inappropriate for display on a public access terminal such as atm 20 a ; ( 2 ) for an image entry , the absence of a predetermined amount of skin tone . the server 14 updates the calendar to record which atms 20 are being used for the new advertisement , so that the calendar provides a schedule indicating which advertisements are to be displayed on which atms 20 at each time of every day . the server 14 uses this calendar for determining which advertisement is to be transmitted to an atm at any particular time . the operation of atm 20 a will now be described with reference to fig3 and 7 . initially , a user inserts his card into the atm 20 a . on receiving the card , the atm application 38 initiates a transaction ( step 200 ) and presents a screen on the display inviting the user to enter his pin . the atm application 38 then requests an advertisement ( step 202 ) from the server 14 ( as will be described in more detail below ) and stores this advertisement in memory 74 . the atm application 38 processes a transaction ( step 204 ) according to the predefined application flow programmed in the atm application 38 . those parts of the application flow which give rise to a “ dead time ”, for example , where a cash withdrawal is to be authorized , include a routine for : ( 1 ) allocating web browser space on the screen associated with the “ dead time ” so that a web browser window appears on the screen for the duration of the “ dead time ” and ( 2 ) activating the web browser to display the stored advertisement ( from step 202 ) in this allocated space . this is illustrated in fig7 by steps 206 to 210 . when the “ dead time ” is over , the allocated space is removed and the application flow proceeds ( step 212 ). [ 0112 ] fig8 illustrates a typical screen 130 presented on the display 52 during a transaction “ dead time ”. the screen 130 includes transaction text 132 relating to the transaction being conducted , and allocated space 134 in which the embedded web browser 36 ( fig3 ) is displaying an advertisement comprising advertising text 136 and an image 138 . the mechanism used for requesting an advertisement from the server 14 will now be described . to request an advertisement from the database 18 , web browser 36 uses a url ( uniform resource locator ) employing the hypertext transfer protocol ( http ). the url identifies the domain name of the server 14 and also a resource ( a database servlet 104 b ) on the server 14 . the format of an http url is shown in fig9 . http url 150 has a protocol field 152 ( in this case http ), a domain name field ( or ip address field ) identifying the server 154 , a directory field 156 identifying the directory structure and resource name to be accessed on the server , and a parameters field 158 for passing information from a client to the server . as illustrated in fig1 , the web browser 36 is pre - programmed with an advertisement request url 160 for accessing the database 18 via the server 14 ; in this embodiment the server &# 39 ; s domain name 162 is “ www . adserver . xyz . com ”, and the resource is “ get_add ” 164 , which causes the server 14 to invoke a database servlet 104 b . the parameters field 166 is generated by the web browser 36 immediately prior to sending the url 160 because the parameters field 166 includes the identity of the client atm 20 a (“ atm3 ”), the time at which the request is made (“ 0930 ”), and the account number (“ 342xx532 ”) of a user of the atm 20 a . as the time at which the request is made and the account number of the atm user changes with each request , this information must be generated for each request . when a “ dead time ” occurs in a transaction on atm 20 a , the web browser 36 generates a new parameters field 166 and sends the advertisement request url 160 ( fig1 ) to the web server 44 . it may not be necessary to include the identity of the atm 20 a in the parameters field because internet datagrams include the ip address of the sender . on receipt of the request url 160 from the web browser 36 , the web server 44 creates a session object for that web browser 36 to track the communications between that web browser 36 and the web server 44 . thus , the web server 44 creates and stores a unique session object associated with each web browser 36 . the web server 44 also invokes a database servlet 104 b for determining which advertisement is to be shown based on the data in the parameters field 166 and the calendar . when the advertisement to be shown has been identified , the servlet 104 b accesses the associated database entry via the jdbc api 106 , reads the translated field entries from the database entry , and operates on these entries to generate an html page . the web server 44 then sends this html page to the atm 20 a for displaying within a screen thereon . the html page is an artificial language version of the advertisement , and has the graphical format and style selected by the campaign manager . the database servlet 104 b responsible for creating and forwarding the html web page to the browser 36 also updates the session object by adding the atm identifier from the request url . thus , for each web browser , the session object includes the identity of the atm 20 a executing the browser 36 . the database servlet 104 b also charges an account associated with the advertisement sent to the atm 20 a . thus , a user at the atm 20 a can view an advertisement from the database 18 without the terminal application 38 having to decide what advertisement to display . in addition to sending an html page to the web browser 36 , the database servlet 104 b also updates the session object associated with that browser 36 by copying advertisement information ( but not the html page ) to the session object . thus , the session object maintains a copy of advertisement information sent to the web browser 36 . when the “ dead time ” is over , the atm application 38 closes the web browser 36 and the next screen in the application flow is presented to the user . various modifications may be made to the above described embodiment within the scope of the invention , for example , in other embodiments multiple authorized persons may be used to screen advertisements , and the server 14 may convey proposed advertisements to each authorized person in turn until an authorized person is available to screen the advertisements . intelligent agent technology may be used to convey the advertisements between authorized persons . in other embodiments , the screening process may be conducted automatically using software for detecting inappropriate keywords and / or inappropriate images , so that no human intervention is required to approve text and / or images in an advertisement . in other embodiments , an advertisement may include one or more sound files for is playing during a “ dead time ”. in other embodiments , the server may allow a campaign manager to store images and text on the server for subsequent use . this has the advantage that a campaign manager can build up an array of authorized images and text , which can be used in an advertisement without any further authorization . in other embodiments , the server may provide a web page authoring facility for the campaign manager so that the manager can place the text and images where desired on a page and the server will construct a web page in that format . in other embodiments , the network connection 32 may be used to connect to the switching device 22 so that the dedicated switching device connection 78 is not required . in other embodiments , the server 14 may use a non - standard port number ( that is , not “ 80 ”) for receiving advertisement requests from the atms 20 . in one type of embodiment the server may generate web pages using perl or cgi scripts . in a second type of embodiment microsoft ( trade mark ) active server pages may be used instead of java ( trade mark ) servlets . in a third type of embodiment the server may generate web pages using dynamic html . in other embodiments , an atm may not include user identification details ( such as an account number ) in the request url . the atm may request an advertisement after each transaction is completed so that the advertisement is available immediately a “ dead time ” occurs .