SUMMARY: /usr/dt & /usr/openwin removal?

Hi gurus,

Thanks to the following for their good suggestions:
Steve Sandau
David Foster
Mathias Kanstrup
and system administration account (nice name eh? ;-))

Solution:

Use pkginfo and pkgrm to determine which packages to remove.  Everyone
agreed that removing the actual directories without removing the
packages was a bad idea and could cause dependecy issues with other
packages/software.
system admin suggested to reapply patches after you remove packages
since they get removed as well.
mathias used this in the past - pkgrm -A `pkginfo | grep -i japanese |
cut -c13-25` to remove packages faster.

Original Problem:

quick question:  Is it safe to remove /usr/dt and /usr/openwin if I am
not using xwindows?  What other dirs or packages are safe to remove (if
you can think of any of the top of your head).  I am running low on
space and these two dirs take up more than 100mb.

Thanks a bunch!
Konstantin Rozinov