IF

The IF keyword may be used to narrow your current selection. This function is on some desks called Only

The IF keyword is access by two presses on the IF hardkey

e.g

you have selected all fixtures that is on by using IfOutput (IF ENTER), but you only want the Mac500's (group 1) that is on: IF IF GROUP 1 ENTER

The If keyword will not select anything, this function does the opposite and deselects...

you may also want ot read about the IfOtput-keyword