+\dt \cw{-d} \e{size}
+
+\dd Alters the maximum size of data transferred in one lump by
+\cw{xcopy}. (Probably most useful for diagnostic purposes.)
+
+\dt \cw{-I}
+
+\dd Inhibits \cw{xcopy}, in write mode, from using the \cw{INCR}
+mechanism for transferring large amounts of selection data a piece at
+a time and waiting for the recipient to acknowledge each chunk before
+sending the next. (Just in case a client doesn't support it.)
+
+\dt \cw{-B}
+
+\dd Inhibits \cw{xcopy}, in write mode, from storing its data in the
+persistent \q{cut buffers} on the root window as well as using the
+peer-to-peer selection mechanism.
+