>subpath</I> is the pathname of the tk widget where drag event occurs,
<LI><I>dropover</I> is a command for <I>drag-over</I> event,
<LI><I>drop</I> is a command for <I>drop</I> event,
<LI><I>force</I> specifies wether or not to call <B>register</B> whenever no option value
has changed (0 by default - for BWidget configuration, use 1 for BWidget creation).
</UL>
<B>setdrop</B> verifies the modification flag of options <B>dropenabled</B> and
<B>droptypes</B> and calls <B>register</B> if needed according to th