This is a short snippet i made for myself when i once needed it and have found it quiet useful since. It allows you to spy on users by opening a custom window and one can open as many as you like. It also tracks nick changes. just rightclick a nick.

menu nicklist {
  Spy: Spy $1
  Closespy: unspy $1
}

ON *:TEXT:*:#: {
  if $($+(%,spy,$nick,$cid),2) {
    if (!$window($+(@spy,.,$nick))) { spy $nick }
    echo -e $+(@spy,.,$nick) 4 $+ $timestamp  $nick $+ : $chan $+ : $1-
  }
}
ON *:NICK: {
  if $($+(%,spy,$nick,$cid),2) {
    unset $+(%,spy,$nick,$cid),2)
    set -e $+(%,spy,$newnick,$cid),2) 1
    aline $+(@spy,.,$nick) -
    aline 7 $+(@spy,.,$nick) $timestamp $nick has now changed to $newnick $+ . auto tracking $newnick
    aline $+(@spy,.,$nick) -
    echo -a 9,1Spyed on user $nick has changed nicks, following new nick $newnick
    renwin $+(@spy,.,$nick) $+(@spy,.,$newnick) 
    titlebar $+(@spy,.,$newnick) Spy module: currently spying on 4 $+ $newnick $+  $network
  }
}
alias spy {
  if (!$window($+(@spy,.,$$1))) {
    echo $active 11,1Spy window has now been opened for $$1 $+ :
    set -e $+(%,spy,$$1,$cid),2) 1
    window -kzn  $+(@spy,.,$$1) 100 50 690 460
    titlebar $+(@spy,.,$$1) Spy module: currently spying on 4 $+ $1 $+  $network | font $+(@spy,.,$$1) 12 arial bold 
  }
}
alias unspy {
  if $($+(%,spy,$$1,$cid),2) {
    window -c $+(@spy,.,$$1)
    unset $+(%,spy,$$1,$cid),2) 1
    echo -a 1,4Spy module for $$1 is now closed.
  }
  else echo -a 7,1There is no spy module set for $$1 to close.
}