Problem solved!
Thanks to all for your suggestions. I downloaded Ethereal and used it to capture the traffic. I was amazed at the detail of the analysis ...
In the messages there were many attempts by the XP Pro laptop to open or close remote printers with lots of "out of sequence" TCP...
I have a similar problem with an XP Pro machine set up for VPN to the office network, that is continually exchanging packets with one of my Home Network computers which has our printers connected to it.
The traffic looks like this:
KEVINSONY:139->D800-2YQ1831:4835 : 40 bytes, protocol: 6...
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