The above are not parameters, but are actually Variables used in a programming language called User Macro B. There are two versions of User Macro supplied by Fanuc, A and B. B is the friendlier, and most desirable of the two, and as stated, the above Variables relate to the "B" version.
For the variables to be relevant, the control must be equipped with the User Macro executable. Its an option, but most 6 Series, model "B" controls on upmarket machines were supplied with this option. So the first thing you need to determine is if your control has the User Macro Option. The simplest way to do this is to look for a Macro Variable Page. From memory, I believe this is accessible via the Offset button, and then Page buttons. Check this out and post back to the Forum if you require further help with using the User Macro option on your machine.