APM webtop to Citrix - what timeouts control session traffic stopping?

Oh - this isn't the F5's fault in any way - in Connection Manager, after you exit one of our launched app, the connection to the server remains open. As soon as you disconnect in Connection Manager, the traffic stops.

So there must be some setting on the Citrix side (or maybe that I can configure into the ICA) that says "upon app exit, disconnect from the server" ... does anyone know of such a setting?