cvs diff: diff between -r tag and -r HEAD

[Sarah Trilling]

Hi,

I'm wondering about the difference

between: cvs diff -r tag1 -r HEAD
and:     cvs diff -r tag1 -r tag2

When I do

  cvs diff -r tag1 -r HEAD

I get errors about files that are in the attic, like:

  cvs server: tag <tag1> is not in file <file>

However, when I do

  cvs diff -r tag1 -r tag2

This seems to ignore files in the attic and just tells
me the strict differences between tags.  I've tried using
.cvsignore to tell -r HEAD to ignore attic files, but this
doesn't seem to work.  Is there anyway to tell -r HEAD
to ignore files in the attic?

Thanks for any suggestions,
Sarah