Here's the code.. it is tested, but as it uses the /list command, you will get the list window.. I was not able to figure out a way around that.
menu * {
Number of Users : .llist $?="Enter channel name (wildcards will work)"
}
alias -l llist {
.enable #llist
.list $1
}
#llist off
raw 322:*:{
.echo -a $2 has $3 users
}
raw 323:*:{
.disable #llist
haltdef
}
#llist end