ability to transfer information between
the same computer, without either application
foreknowledge of the other, was one of the
features of early window-based user interfaces.
of data transfer remains one of the most useful
user-oriented features of the Windows operating
today. Drag and drop is a more recent incarnation
classic clipboard transfer, allowing users to
data between applications by simply dragging
windows (no clipboard involved). This capability
on top of Microsoft COM
technology, and has become relatively easy to add
Visual C++ based applications.