You can run 2 MS clients at once in W7

i thought this was known by everyone

its quite handy when i wanna leech myself. bm on laptop, pg/hs/leech character all on different users on pc x33

You can't do it in vista without some sort of program (and most of them ban you afaik). With this you don't need anything, you can just switch users with you want to control a different character. Though i'm pretty sure you can do it in XP.