You can switch between Horizon Client and other apps without losing a remote desktop or application connection.
You can resize the Horizon Client app so that it takes up part of the screen alongside another app.
If you leave a session idle for some amount of time, before the session times out, you receive a prompt, asking if you want to keep the session alive. Tap or click anywhere on the screen or press a key on your keyboard to keep the session alive. If enough time has passed so that the connection to the remote desktop or application was lost, Horizon Client returns to the desktop and application selector screen and prompts you to reconnect.