Tip: occasionally clean the
xcrysden's scratch directory (i.e. $XCRYSDEN_SCRATCH).
This can be done also by the xc_cleanscratch utility.

The documentation of
XCrySDen is available only in HTML
format. For the beginners, it is strongly suggested to start with
the
Short introduction to XCrySDen (read at least
subsection
1.3 Useful
hints).
Here you can download XCrySDen documentation as
tar-gzipped archive (file xcrysden-doc.tgz, size: 3.3
MB).