Var %z = #chan #chan #chan
I would say in the description that people need to put exception channels in there.
If ($Chan(%x) !isin %z) {
I would use !$istok rather than !isin, because a restricted channel could be #test123 and #test would match. If you don\'t know what $istok does, it\'ll check if $chan(%x) matches one of the tokens in the %z variable (each channel in this case).