See your sticky remote keys
Open this tool and it shows you the modifier keys that are currently pressed.
=> A very useful tool when working remotely <=
Apple Remote Desktop had a bug in it for several years, which causes
the SHIFT, CTRL, ALT, CMD key-presses, etc. to only be sent WHEN
a normal key is pressed. This works fine when TYPING,
but IN COMBINATION WITH THE MOUSE
it is a catastrophe.