One of the simplest ways to debug a service is through the use of the Task Manager in Windows NT 4.0. While the service is running, start the Task Manager and click on the Processes tab. Use the right mouse button to click on the name of the EXE and then click Debug. This launches Visual C++ attached to that running process. Now, click Break on the Debug menu to allow you to set breakpoints in your code. Click Run to run to your selected breakpoints.