In the following, the "PROGRAM" (which isn't followed by a comma) is the optional indirect object:

    system LIST
    system PROGRAM LIST
[...]
            Like `exec', `system' allows you to lie to a program
            about its name if you use the `system PROGRAM LIST'
            syntax. Again, see the exec entry elsewhere in this
            document.
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at least I think that is what Larry called that.

        - tye (but my friends call me "Tye")