-"""When true, the placement algorithm will attempt to place windows even
- when they request a position (like XMMS). Note this only applies to
- normal windows, not to special cases like desktops and docks."""
+"""When non-zero, the placement algorithm will attempt to place windows even
+ when they request a position (like XMMS). Note this only applies to normal
+ windows, not to special cases like desktops and docks."""
+DONT_DUPLICATE = 1
+"""When non-zero, if 2 copies of the same match in history are to be placed
+ before one of them is closed (so it would be placed over-top of the last
+ one), this will cause the second window to not be placed via history, and
+ the FALLBACK will be used instead."""