If a page times out, the client will display the "We paused while you were away. Please refresh to continue." message.

In the case of unsaved data on the page (perhaps in a javascript based control) the data will be lost.

Please add a page trigger like this, perhaps with a return value to allow or prevent the timeout. This could also be used for pages that should be allowed to keep running.

trigger OnPageTimeout() : AbortTimeout : Boolean
begin
saveimportantstuff();

exit(true); // Keep the page running
exit(false); // Just time out!
end;