What software are RV parks using to keep track of things?

We've always asked for a general idea of what sites are available for our intended length of stay and have always had the CG employee be as friendly and helpful as s/he could be. We try to give them an idea of what we prefer and are conscious of how busy they are. Being nice to folks, especially in service positions, almost always pays off.
And we have never had a problem later changing sites if there is a problem with the one we originally got. Again, go when they arent busy and be nice.