Query parameter(s) for tracking search terms using Google Analytics?

I want to track the search terms used in WebHelp with Google Analytics. Within the Site Search Settings is a field Query parameter. Does anyone know what that parameter (or parameters) is for WebHelp? It is not obvious because the URL doesn't change; therefore, the parameter doesn't appear in the URL. I saw a previous post identifying the JavaScript file that might identify it, but I forgot its name and they never specifically mentioned the parameter and I couldn't tell what was what.

Thank you.