The Copy Bitmap command copies the image bitmap to the clipboard as a 24 bit Windows Bitmap. It can be readily pasted into other software using the Edit > Paste protocol. This command differs from the Copy Window command in that no overlays are copied. Essentially, the Copy Window command copies the screen in front of the image and the Copy Bitmap command copies the bitmap of the image data.
Copy & Paste Commands, Copy (Ctrl+C), Screen Capture