Remote user-mode debugging involves two computers: the client and the server. The server is the computer that runs the application to be debugged. The server also runs the user-mode debugger or a process server. The client is the computer that remotely controls the debugging session.
Remote kernel-mode debugging involves three computers: the client, the server, and the target computer. The target computer is the computer to be debugged. The server is a computer that runs the kernel debugger or a KD connection server. The client is the computer that remotely controls the debugging session.