Like most people, I've known for a while that you can manually kill certain processes to restart Notes/Domino after a crash, and that there are plenty of utilities out there which can help do this for you. However what I didn't know, is that in release 6.x they included this functionality out of the box for both client and server. Very handy to know (taken from the knowledgebase):
How Do You Restart Notes/Domino 6.x After It Hangs?
Document Number: 1108182
Problem
Your Notes/Domino 6.x client or server has stopped responding and you need to end any processes that are still running. Normally in this case, you would need to reboot. Is there an easy way to terminate any Notes processes that are still running without having to reboot?
Content
In Notes/Domino 6.x you have the ability to run nsd -kill on both the server and the client. This will kill any Notes processes that are still running, prohibiting you from starting the Notes client. The command should be issued from the Notes program directory from a DOS window. For example:
1. Open a DOS window. Using Windows, this would be: Start, Run, Command.com
2. Change directories to the Notes program directory; for example, cd \Lotus\Notes
3. Enter the command: nsd -kill
Note: Although nsd can be executed from the program directory, it is really designed to be run from the data directory.