In the client_state.xml there is a tag:

<cross_project_id>

Anyone knows is the number is web searchable on some site.

It's not the Cross project ID that is mentioned on the project account page.

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TThrottle The way to control your CPU and GPU temperature.
BoincTasks The best view of BOINC.
My other activities

It's probably the Host (computer) CPID, which is not the same thing as the User CPID you're thinking of. I don't think it works very well - it's implicated in the batches of 'abandoned tasks' we see sometimes.

It's actually the internal User CPID.

wiki

It's actually the internal User CPID.

wiki

Yep, I got another answer as well from David.
The host CPID in the client differs from the "external CPID" exported in the stats file

http://boinc.berkeley.edu/trac/wiki/HostId

David will add the external CPID to the client and projects as well.

This is something I will implement in BoincTasks.

It got me confused, because the internal and external CPID are both called by the same name.

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TThrottle The way to control your CPU and GPU temperature.
BoincTasks The best view of BOINC.
My other activities