You could attach a debugger to a running process if debug info was generated and available. More debugger information/download can be found here
http://www.microsoft.com/whdc/devtools/debugging/default.mspx[
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You cannot use reflection to simply assign a running process and "watch" it as if it was your own. For orher .net dll this is possible however because they run in the same process but again debug information must be available. Reflection is, as the name implies, a view at yourself.
Good luck!