Well, it's just global if nothing is "active" in Windows. If you have everything minimized (or at least, not active), then it's global. If one mIRC (or another program) is maximized/active, then it's specific to that program. I believe this is a standard Windows behavior. In any case, this has allowed me to reopen a frozen mIRC that was minimized to the tray without having to kill the process.

Invision Support
#Invision on irc.irchighway.net