This archive contains the freely distributable "spatch"
utility, provided with the SAS/C compiler package.  It
is to be used in applying updates to the software and
hypertext used with "The Digital Universe".

You must ensure that you are using the right patch file
for it to be of use.  Patch files will be named as follows:

  filename_oldver_newver.pch

to patch <filename> from an old version number to a new
version number.  For example, the file to patch
spacecraft.guide from version 1.00 to 1.01 would be
named:

  spacecraft.guide_1.00_1.01.pch

To see what version of a file you are currently using,
type "version" followed by the name of the file.  If it
says "Error: No version string found", you can assume that
the file is version 1.00.

To use "spatch" to apply the patch, just type something
like:

  spatch -pspacecraft.guide_1.00_1.01.pch spacecraft.guide

provided that the patch file and "spacecraft.guide" are both
in your current directory.  It will then create a file
called "spacecraft.new", which you can then use to replace
the old "spacecraft.guide" if everything worked out.

ENSURE THAT YOU KEEP A COPY OF THE ORIGINAL FILE YOU ARE
PATCHING UNTIL THE PATCH HAS BEEN SUCCESSFULLY APPLIED!  If
you do not keep a copy and something goes wrong during the
patch, you may otherwise have to re-install "The Digital
Universe" from scratch.
