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cvs -d :ext:. at my-cvs:/cvs/repository  version

Note: the user doesn't need to be specified as by default it will use
the currently logged in user.

You will see output like:

C:\Program Files\CVSNT>cvs -d :ext:. at my-cvs:/cvs/repository  version
Client: Concurrent Versions System (CVSNT) 2.5.03 (Scorpio) Build 2382
(client/server)
Server: Concurrent Versions System (CVSNT) 2.5.03 (Scorpio) Build 2260
(client/server)

In eclipse Windows > Preference browse to Team > CVS > Ext Connection

    * CVS_RSH=C:\Program Files\CVSNT\extnt.exe
    * Parameters={host}
    * CVS_Server=cvsnt

Now open the CVS Repository Exploring perspective and create a new
Repository Location. Paste :ext:. at my-cvs:/cvs/repository into the host
field (Eclipse will automatically parse this and populate the correct
fields) Click Finish and you should have working CVS access.

p.s. I recommend not using extnt.exe directly as I spent a few hours
guessing the format (I probably should have looked up CVS_RSH
definitions) and failed to get anyway. But as soon as I used cvs
(which invokes extnt.exe for me) I had no problems connecting.