How is the XP Professional PC connected to the other PC?
What software is installed on the XP Professional PC?
All in all your question appears to be a homework assignment. Forum rules prohibit doing homework.
Indeed; your question may not be homework but we have no way of knowing the truth of the matter.
Here is what you should do:
Work out what you can, add more information, and ask more specific questions.
Plus present what you believe are the answers to those questions.
There are a number of ways to synchronize data between computers. And the exact processes used can vary.