[cvsnt] how to control the update action merger the new change to local file without any comments?

[ari]

hi all,
    When I try to change my version control server from VSS to CVS, I found 
some problems.
I have some file types that just can be mergered without comment(such as 
*.dfm -- one of delphi's source file types).
    So, my question is how to update and merger the changed to local file 
without any comments?  The file must be mergered the remote and local change 
like "Text file" without comment.
    I used CVSNT 2.0.58d and WinCVS 13b21-2!

  Regards,
                                                Ari