+\dt \cw{-b}
+
+\dd Causes \cw{xcopy} to read or write the clipboard instead of the
+selection. (Modern GNOME and KDE-style programs can often interact
+with both. The \e{selection} is the traditional X-style storage
+location which you typically copy things into just by selecting them
+with the mouse, and paste with the middle mouse button. The
+\e{clipboard} is a more Windows-like location which you access using
+explicit Cut, Copy and Paste commands in your application.)
+
+\dt \cw{-t}
+
+\dd Causes \cw{xcopy}, in read mode only, to return the list of
+possible target types currently stored in the selection. This is
+probably only useful for debugging X applications or X selection
+issues.
+
+\dt \cw{-T}
+
+\dd Causes \cw{xcopy}, in read mode only, to return the time stamp
+for the current selection. This is probably only useful for
+debugging X applications or X selection issues.
+
+\dt \cw{-a} \e{target atom}
+
+\dd Causes \cw{xcopy}, in read mode only, to return the selection
+contents corresponding to some particular user-specified target
+type. The target type can be anything listed by \cq{xcopy -r -t}.
+
+\dt \cw{-v}
+
+\dd Causes \cw{xcopy}, in read mode only, to produce a verbose
+commentary on the progress of reading the X selection. Can be useful
+for debugging interactions with other programs.