How can I instal an old dot matrix printer - a Star Gemini-10X - on
either of two unlinked PCs running on Microsoft Windows XP
Professional?  The printer is not shown in the list given in Windows
XP's printer set-up wizard. I have downloaded some drivers for the
Gemini-10X from the Web, but these, at first glance, appear not to be
Windows-approved. While one of the PCs, my own, is Internet-ready, the
real point of the question is to enable me to instal the printer on
the other PC (that of a relative), about 5 miles away, which does not
have a modem.

You can install the printer on LPT1 using the "Generic" printer driver
which comes standard with all windows. But the Generic driver wont
support advanced graphics but will be just fine for printing text.

I would recomend trying the drivers you have even though they are not
reported as compatible. You will probably find they will work, just
that Microsoft wont support them. The worst that will happen is the
drivers will send pages and pages of gibberish to your printer.

It looks like you can get printer manuals from
http://www.star-micronics.co.jp/eng/dl/dl01_02.htm

If you check the manual you will probably find that, with a
combination of DIP switch settings on the printer, the Star will
emulate an Epson printer which is more likely to be supported by
Windows (possibly as a generic Epson model). This will give you
betters uypport of fonts etc than the plain text generic driver.

Owain

what type of communication does this other computer have?
Internet, Serial RS232?