Paul, about the missing XZ80 data: most likely, this is happening
because you downloaded the .TDF file, but not the actual data. In such
a case, Guide will read the .TDF, look for the specified data file,
not find it, and decide not to list that dataset.

Some directions on how to get the XZ80 data, and how to get Guide
to recognize it, are given at

http://www.projectpluto.com/extras.htm#xz80p

Pierre, about listing stars: I'm contemplating something of this
sort, but making it a little more general in scope. It really ought to
be possible to make lists of _any_ objects shown by Guide. I've written
some comments about this today at

http://www.projectpluto.com/future.htm#data_tables

Kevin, about saving marks: yes, I see the problem here... ideally,
if you've just loaded a mark named "location 2", when you go to "save
a mark", Guide ought to offer the suggested name "location 2" for that
mark. It doesn't; instead, it remembers the name last used in the
"save a mark" dialog.

However, you can replace that name without difficulty. If Guide
offers you a "wrong" name, just replace it with a "right" one.

-- Bill