This is half for developmental purposes but also half just for general knowledge; I'm compiling a list of critical Windows processes that a user should avoid terminating.
A really good resource for information about which services are critical:
(the system process; I assume kernel)
(will restart if it crashes but stays closed if terminated)
(this is printing related, not actually critical)
(firewall related, see note at end of post*)
(actually fairly safe to close since it'll restart)
Are there any more which shouldn't be closed? Are any on this list not actually critical and safe to close?
I'll update this post with new information so it'll hopefully be a useful resource for... well, anyone who searches for this type of thing I guess.
* According to Neuber.com
: Application Layer Gateway service is a component of [the] Windows OS. It is required if you use a 3rd party firewall or Internet Connection Sharing (ICS) to connect to the internet. Do not end this program in task manager - you will lose all internet connectivity until next restart or login.