Q: Sometimes while I'm developing my application, it locks up the system. How can I close my application without resetting CE?
During development, you should probably have your application inside a window with an "X" in the corner to easily close the application. If it doesn't respond, in CE 2.11 you can terminate the application using the Task Manager application (available from the Bsquare Tools Tools button or \Windows\TaskMgr). Under all builds of CE, you can use the remote Process Viewer application from the Windows CE toolkit to terminate a process. You will need to use CE Services (ActiveSync) to connect to your device.
Also see this post about restarting CE without erasing the contents of RAM.