"Share memory from previous run" Lotus Notes error

Notes sometimes hangs even when I try to save something in Designer (today it was an agent).

After few minutes of waiting, I have killed all processes that looked like they have something in common with Lotus Notes.

But this crash was stranger than expected. After I tried to run Notes again, message appeared telling me something like "Share memory from previous run of Lotus Notes found, this process will stop".
So I killed that new process (it didn't look like it's going to quit) a tried to find something on google. I have found several solutions, but what worked for me, was this one (for Windows 7 x64):

1) Start command line with admin privileges (Start - write cmd, right click, "Run as administrator")
2) Go to folder where is Notes installed (usually "C:\Program Files (x86)\IBM\Lotus\Notes\Data")
3) Run "nsd.exe -kill"

Don't ask me what it does, but it worked for me and saved me (hopefully) one restart :).
And thanks to that guy who wrote that solution to some Internet discussion, yet I don't remember where I found it (and I don't want to look for it again).