SYNOPSIS
        int valid_query_snoop(object ob)

DESCRIPTION
        Should return 1 if previous_object() (the one that called the
        efun query_snoop()) is allowed to query whether ob is being
        snooped, 0 if not.

        The master object is always allowed to use query_snoop().

SEE ALSO
        valid_snoop(M), query_snoop(E), snoop(E)