Prdesktop Hotkey setting
r
Press the hotkey key to show options dialog.
Press the hotkey key to switch to next desktop.
Press the hotkey key alt+1 to switch to desktop1,alt+2 to desktop2.
Press the hotkey key Ctrl+1 to switch to desktop1,Ctrl+2 to desktop2.
Press the hotkey key Shift+1 to switch to desktop1,Shift+2 to desktop2.

Enable this options then you can press left and right mouse button at the same time to switch to desktop1.This feature help you to make a quick switch within a split second.
Check this option if you wish to hide from someone's eyes that Prdesktop is running on your computer.