i'am a c# developer but I don't have much experience with c++. I'am curious if it is possible and how to add drad & drop functionality to a window of an external application. From my application I start an external application. I want to be able to drag an item(e.g. a rectangle) from my application to the external application.On drop, there would be called a function doing something. Any tricks are allowed.I've been thinking about embedding the external window in a new layered window. Would it be possible and could work for drag&drop? Thanks in advance for any suggestions and maybe some short code example.