Today, I got a "Shared memory error" after the Notes client crashed.
KillNotes didn't clean all the processes. This resulted in not being able to start Notes again. I did a little search, and found the solution.
I created a small bat-file that executes the NSD-command. If you want to use it, you probably have to change the line that has the path to Notes, "cd \Program Files\lotus\notes\" to fit your environment.