Apple Macintosh PowerBook 1400 - Manual (Page 76)

Shared libraries
Native programs use special files called shared libraries. These files help the
programs to run more efficiently and can be used by more than one native
program simultaneously. Any necessary shared libraries are installed
automatically in the System Folder when you install native programs.
If a native program requires a shared library and there is not enough memory
available for the shared library, you’ll see a message that the program could
not be opened because of insufficient system memory. If this happens, see the
“Memory” topic of Mac OS Guide, available in the Guide (h) menu, for
instructions on turning on virtual memory.
If a required shared library is missing, you’ll see a message that the program
could not be opened because the shared library could not be found. If this
happens, follow the directions that came with your program to reinstall the
program. If the shared library is still missing, contact the program’s
manufacturer for assistance.
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