Identifier 

reg {
  if ($1 == !true!) { 
    return TRUE
  }
  else if ($1 == !check!) {
    if (!%numcheck) {
      return FALSE
    }
    /unset %numcheck
  }
  else {
    %reg.nick = $1
    whois %reg.nick
    pause s 1
  }
}


--------------------------------

Regcheck.mrc 

RAW 318:*:{
  reg !check!
}

RAW *:*:{
  if ($numeric == 307) {
    %numcheck = 1
    reg !true!
    haltdef
  }
}