[cvsnt] Several questions on cvs usage

[Tom]

Is there a command get a list of all the locally modified files in the cvs?
The coomand "cvs  status -q -R" will display status of all the files, for 
the module with many files, it will be diffcult to find which files are 
modified with this command.

Is there a command to invoke a GUI differ (exp: windiff on windows) to 
compare two revisions?
(BTW: cvs xdiff doesn't work the way we expected)