t once.
<P>
The <B>grab</B> command can take any of the following forms:
<P>
<DL class="description">
<DT><A NAME="M5"><B>grab </B>?<B>-global</B>? <I>window</I></A><DD>
Same as <B>grab set</B>, described below.
<P><DT><A NAME="M6"><B>grab current </B>?<I>window</I>?</A><DD>
If <I>window</I> is specified, returns the name of the current grab
window in this application for <I>window</I>'s display, or an empty
string if there is no such window.
If <I>window</I> is omitted, the command returns a list whose ele