xtroff.tar.Z is a new release of xtroff - the troff previewer in
contrib/clients/xtroff on the X11R4 tape.  This release should work
with Chris Lewis' psroff, GNU groff as well as AT&T and Berkeley
ditroffs.  It's *considerably* improved over all previous versions, so
you are strongly advised to upgrade to this.

This xtroff is at patchlevel 10.