Clips are clipboard-like documents. In fact, the Clipboard is considered a clip in Source Insight. Instead of having only one clipboard, Source Insight lets you have many clips. A clip is like any other file. You can edit it the same as any other file. The difference is that clips are automatically saved between sessions and clips can be pasted easily with the Paste From Clip command.
Clips are useful for rearranging code, especially between many files. Clips are also useful for boilerplate text that you often want to insert.
You can toggle the Clip Window on and off by running the Clip Window command, or by running the Activate Clip Window command, which makes it visible and then sets the focus on the Clip Window text box.