Hugs will find modules automatically if you put the directory containing them on its search path.
This can be done using the -P option on the command line, using the :s command within Hugs,
or (most conveniently) in the environment variable HUGSFLAGS. For example, to access the
SOEGraphics modules on the CS Solaris systems, you can add the following environment variable setting
to your .cshrc or equivalent file:
The trailing colon (:) is significant: it means to append this directory to the existing path
(which already contains the standard libraries). On Windows systems (where you want to point
to the win32 subdirectory) use a semicolon (;) instead.