I'm afraid not. There are no native SEE Manager Console commands to prompt client machines to check-in.
I suspect you might be able to get a client to check-in with the server via other means though. Have a look at the new fangled SEE11 command line article:
http://www.symantec.com/docs/DOC7716
Again, though, getting the command to check-in to the client would be performed via other means like psexec, SCCM, Altiris, and not natively via SEE itself. It's entirely possible that whatever you're trying to get the client to check-in to do, is possible via these commands anyway!