Forums Scripts & Popups Automatic answers only one time

I read many times before and now the help of
/help if then else inside mirc and http://en.wikichip.org/wiki/mirc , but I didn't found trace of this
costruction.

The costruction is :

if (!$($+(%,private,$nick),2)) ;

Sorry , but I don't understand the expansion of this
expression, and I don't found nothing to understand it.

Thanks