Shows the rectangular part of a source viewport in one or more destination
viewports. It should be noted that source and destination can refer to the
If the command is started by a mouse gesture then the destination window is
In all other cases the destination window must be explicitly defined if the
window layout contains more than one window.
The destination window is identified by a digitized point or by typing its
identifier. Since the identfiers are powers of two (e.g. 1, 2, 4, ...) a
whole destination window set can be defined by adding the identifiers of all
windows of the set (e.g. 1 + 2 + 4 for window 1, 2 and 4). A destination set
containing all windows is described by the identifier -1.