hey guys im new here nice 2 meet yall

just wondering i thought while having 2 moninters i could drag my mouse cursor to the other moninter while palying dota for a fast reply in msn

but the problem is when i bought this moninter i could drag it in desktop mode
but when i on my warcraft i couldnt drag my mouse cursor to the other moninter

is it possible or any idea how i could drag it?
thanks alot!
would appreciate it !!