What is Session Pre-Launch in Citrix ?
Session pre-launch allows a user (or rather Citrix Receiver) to silently connect to a XenApp farm assuming that the session will be required in the near future. When a user actually starts an application, the startup time is dramatically reduced because a logon is not necessary and session sharing allows published application to be launched inside the active session. As soon as Citrix Receiver starts on the client device, a pre-launch session is created in the background. As soon as a published application is requested by the user, XenApp can immediately start it in the existing session using session sharing.
Session Pre-Launch uses two timers to determine whether the pre-launched session is kept available:
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Disconnect Timer: Once this timer runs out, the session is disconnected. If the disconnect timer is set to zero, the terminate timer determines the fate of the pre-launched session.
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Terminate Timer: When a terminate timeout occurs, the pre-launch session is terminated. But this may still result in the session to be retained if session lingering is configured (see below). Without session lingering, the session is ended and the user will have to suffer the logon time when launching a published application.
The Citrix eDocs contain a short description of both timers as well as more information about the hidden pre-launch application. In addition, this video below provides a walkthrough for setting up session pre-launch. Citrix employee David Gaunt has published a very detailed article about session pre-launch and what it looks like in AppCenter.
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