yes, it looks at a fine-grained clock, usually a cycle counter provided by the CPU for this purpose, to aggregate total on-cpu time for each process.

I think a lot of modern kernels are “tickless” - they don’t use a timeslice timer, and only context switch on IO interrupt, process yield, or when timeouts are specifically requested (including capping cpu-bound processes). https://en.m.wikipedia.org/wiki/Tickless_kernel

I think they limit your total ammo inventory in some Nordic country. You have to bring back casings to buy more ammo - solves two problems.

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Ah, I read the requestor as wanting to disallow body text.

The opposite of that request, yes.

More policy and culture than implementation. Rarely see pages of links to mass media sites on your average phpBB, though.