although I don't think the command depends on the server...
It is. mIRC has to adjust the command output depending on the server software, because many servers are not smart enough to handle @#channel messages.
| | | | undernet |
| | | | quakenet |
| dalnet | efnet | ircnet | gamesurge |
| (bahamut) | (hybrid) | | (ircu) | (unreal)
| | | | |
| | | | |
notice | @+# | @# | - | @# | @+#
| | | | |
msg | @+# | - | - | - | @+#
| | | | |