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The TSAPI service uses Tlinks and Tlink groups to advertise (to clients) which switch connection or set of switch connections it supports. When a user starts an application at a client workstation, the application specifies which Tlink it should use. It may present a list of Tlinks to the user and prompt the user for a choice, or it may get the correct Tlink from an initialization file. The application then includes this Tlink in the request to establish a connection.
When the TSAPI service receives the establish connection request, it saves the Tlink name. Future application requests to control devices using this Tlink are checked by the TSAPI service. If the device can be accessed by this Tlink, the request goes through. If not, the request is rejected.
If you need this type of checking just described, you need to create groups of Tlinks. Each group is called a Tlink group. You then associate a particular Tlink group with each device, thus limiting access to the device to the Tlinks that are in that group. The following topics provide examples of how Tlink groups are used.