I downloaded the latest DCX updated for mIRC 7+ and Win7. DCX comes with aliases you need to make it all work and it was the syntax of some of these that I was wondering about.

This isn't a DCX question, this is a MSL question.

Can someone tell me about !if and /returnex please? Thank you.

alias xtreebar {
  !if ($isid) returnex $dcx( _xtreebar, mIRC $prop $1- )
  dcx xtreebar $1-