HELP ISPROTECTED                            Jonathan Laventhol, August 1984.

Some identifiers are protected against being changed by users.  You can find
out if the identifier associated with a word is protected like this:

        isprotected("isprotected") =>
        ** <true>

        vars x;
        isprotected("x") =>
        ** <false>

See HELP * SYSPROTECT, *SYSUNPROTECT, *SECTIONS