If you look at helpdesk, most of the questions have nothing to do with helpdesks, or they are denoting a "helpdesk"-style question. I recommend that this tag be deleted because it does not have a clear purpose, nor are they useful in any way.
Questions about setting up a helpdesk service are off-topic for Super User. If the question has to do with helpdesk software, it might be on-topic for Server Fault, but remember not to migrate crap. In any case, this is a meaningless meta tag.