This alias alters mIRC's /amsg command by sending your message to all channels except from specified ones. I think this would come i handy if you don't want to send your message to some of the channels you are on when doing an /amsg. If you don't enter a channel on the prompt, the mesage will be sent to all channels like the regular /amsg command. This was requested by Phantom so credits to him too.
Copy/paste to your aliases section. (ALT-D)
amsg {
var %w = 1, %x = $?="Enter #Channel(s) separated with a space (Where you don't want your messages to be sent):"
while $chan(%w) {
if ( !$istok( %x, $v1, 32) ) msg $chan(%w) $1-
inc %w
}
}