secure desktop area popup

When I use my kvm switch to switch to another computer (well .. it is actually just K/M, I have video monitors attached to both so I can see both) then TDE puts up the "secure desktop area" dialog, hiding my desktop. It says <username> is currently logged on, and gives options for Lock Session, Task Manager, Logoff, Menu, Cancel. How can I disable this "secure desktop area" dialog? I never want to see it again. If I switch my keyboard and mouse away from this computer, I want to continue to see whatever was showing before. Thanks! ~David.