Khaled rolled his own. I'm not actually sure what it's based on or similar to; I assume it's some sort of RichEditW class window, but very customized.
Next time you go to reboot, try closing all programs except mIRC, to see if text selection comes back. Unload Saturn's DLL too, and kill the antivirus and file explorer is possible. Couldn't say if Saturn's DLL is leaking or causing mIRC to trip up.
And yes, NirSoft's progs are great!
