True, I'm just thinking that if you allow one copy of mIRC to 'know', (using wellhole's expression) of other copies of mIRC that are currently running then there'd need to be something that would keep that secure in some way. There's another issue. As this bug also removes mIRC from the list of processes in Task Manager, how would mIRC be able to pick this up? By my way of thinking there's little point in having a function like this unless copies of mIRC were able to control functions in the other in some way, such as restoring the icon perhaps? It seems to be that this is what wellhole wants. It's just better to wait for Khaled to fix the disappearing icon bug I reckon.
Having said that, this bug has only affected me on a few occasions.