NAME
        GetDefaultPubScreen -- Get name of default public screen. (V36)

    SYNOPSIS
        GetDefaultPubScreen( Namebuff )
                             A0

        VOID GetDefaultPubScreen( ubyte * );

    FUNCTION
        Provides the name of the current default public screen.
        Only anticipated use is for Public screen manager utilities,
        since it is easy to open a visitor window on the default
        public screen without specifying the name.

    INPUTS
        Namebuff = a buffer of MAXPUBSCREENNAME.  This can be NULL.

    RESULT
        None.  Will provide the string "Workbench" in Namebuff if there
        is no current default public screen.

    NOTES
        This function actually "returns" in register D0 a pointer
        to the public screen.  Unfortunately, the lifespan of
        this pointer is not ensured; the screen could be closed
        at any time.  The *ONLY* legitimate use we can see for
        this return value is to compare for identity with the pointer
        to a public screen you either have a window open in, or
        a lock on using lockpubscreen(), to determine if that
        screen is in fact the default screen.

        Also note that if there no default public screen has been set,
        the return value of this function will be zero, and not a pointer
        to the Workbench screen.

    BUGS
        The function prototype does not reflect the return value.

    SEE ALSO
        setdefaultpubscreen(), openwindow()