If your in Lazarus and not pure FPC then include the ClpBrd unit and use the methods and the Clipboard object defined within it. As for capturing the Ctrl+V, Ctrl+X and Ctrl+C events, use a global application TActionList.

If your in FPC, then look at the Lazarus ClpBrd unit, as it is VERY valuable. Then create a monitor process to look for your key-presses. When you find one, fire the appropriate handler.