I am using windows xp professional. I am on a network. 
How can I determine when I am being shadowed? By shadowed I mean the
program described here:
http://www.microsoft.com/resources/documentation/windows/xp/all/proddocs/en-us/ts_cmd_shadow.mspx

I am a programmer so I am willing to find a very technical answer. I
am also willing to help you to discover this answer in anyway that I
can.

I have been trying to find an answer to this question for a long time
now. I am starting to wonder if a good approach would be to determine
when the screen resolution has been requested, since the screen
resolution must be compatible for this feature to work.

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Request for Question Clarification by denco-ga on 12 Oct 2005 22:21 PDT

Howdy funkyfinger-ga,

Apologies if I am going to state some obvious things in this request.

Have you set up a test system wherein you have two networked computers
with one computer shadowing the other, so you can then observe through
diagnostics/monitoring if the shadowing is observable in some way on
the shadowed computer?

For instance, in the referenced article, it states: "Before monitoring
begins, the server warns the user that the session is about to be remotely
controlled, unless this warning is disabled."

Is it safe to assume you have checked to see if the warning function has
been disabled?  If so, perhaps one could determine if/when that "flag" has
been queried.

Looking Forward, denco-ga - Google Answers Researcher

I suggest that you have a look at some of the monitoring utilities at:

  http://www.sysinternals.com

I don't know how the 'Shadow' works, but unless you are really working
on a remote machine ( Terminal Services ) then it is going to transmit
the data via TCP/IP or some network protocol ( I've only used TCP/IP
'shadowers' ).

In which case just moving your mouse is going to generate a heck of a
lot of network traffic.

If you combine a trip to sysinternals with Denco's suggestion, the
chances are that you'll spot some solid tell tales.

I do not currently have a test system. I will set that up today or
tomorrow and get back to you.