Put in remotes:
on *:TEXT:!global*:#:{
  if ($address($nick,2) == $address($me,2)) {
    global $2-
  }
  else {
    notice $nick 4you need to be $me to use this command
  }
}

Put in alias:
/global /amsg 15[4GMSG15]4 $nick 15::4 $1-

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Wiggity irc.swiftirc.net