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Users can obtain online information in several ways, including
the operating system help utilities, the IDL command HELP, and
the IDL procedures called DOC_LIBRARY and PROLOG. Each of these
is described below.
First, you may be able to ``spawn'' to the operating system to access the help
utilities available on your machine (if your machine supports such things).
For example, on the IUE alpha VMS HELP is available. To use VMS HELP you
at the IDL prompt. On UNIX systems you may access man pages in
the same way.