Re: Question about Compaq Recovery CD
What Rooster said, plus it will normally work only with the brand name (in the this case Compaq) that it's made for. Sometimes it will only work with that certain system it's made for.
I have an OEM disc with my HP, not recovery, just OS. It will work on HP/Compaq systems and normally won't require to input a CD key. If used on any other system, you need a CD key, but it will work.