Here's a script that creates a Desktop Window when somebody mentions your nick on mIRC channel window (Nick alert script).

Every time someone mentions your nick, new entry is added into a single Desktop Window. In case someone needs it, here's the script code:

on :Text:$( $+ $me $+ *):#: {
if (!$window(@mIRC-NickAlert)) { window -mdk0 @mIRC-NickAlert }
window @mIRC-NickAlert
aline @mIRC-NickAlert 3Network: $str($chr(160),8), 6 $network
aline @mIRC-NickAlert 3Channel: $str($chr(160),8), 8 $chan
aline @mIRC-NickAlert 3Nick: $str($chr(160),14), 12 $nick
aline @mIRC-NickAlert 3Date & Time: $str($chr(160),2), 4 $+($date(yyyy mmmm d) ,$chr(32),2 $chr(40),$date(dddd),$chr(41) ,$chr(32),10 $time )
aline @mIRC-NickAlert $crlf
aline @mIRC-NickAlert 13T e x t: $str($chr(160),12), $1-
aline @mIRC-NickAlert $crlf
aline @mIRC-NickAlert 5-----------------------------------------------------------------------------------
aline @mIRC-NickAlert$crlf
}

View the image in order to see how the script looks in reality.