The Debugging a Running Process section of this overview describes attaching the debugger to a running process. The Writing the Debugger's Main Loop section of this overview describes the functions used in the debugger's main loop of execution. For an example of how to organize the main loop, see Using Debugging Support.
Although most of the Win32 debugging functions are used to create a debugger, several functions are designed for use in the process being debugged. For more information, see Communicating with the Debugger.