Sorry for another newbie question, but I have searched and cannot find an answer.

I am trying to figure out some terminology on strings and cables. I talked to my local Archery shop to find out how much it is to have my crossbow strung. He told me that I could buy their string or bring my own. He alsosaid if it was my serving string that needed replacedI might want to do it myself. What exactly is the serving string and how would I go about replacing it? Is the serving stringwhat goes around the wheels? I guess I am confused about what he is calling the serving string and the center serving. The center serving comes on all new sets of strings, correct?

The guy who i bought my used Horton from said the strings in it were fairly new. Should I take it to my local Archery shop and have them look them, just have the string replaced so I know it's good, or just use the current string untilthey break?

I really do not know anyone who uses a crossbow to ask so this is pretty much my only outlet. Any help is greatly appreciated. I was able to finally find the manual on the Horton site, but it is kind of limited.