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that's just what the doco says: "alarm Emulated using timers ...".
In the sense that the OS has neither a native alarm API nor *nix-style signals, it is emulated.
But then again, under modern versions of *nix including linux, the original form of alarm is also "emulated with timers", so not so different.
perlport says it's "unsupported"; perlfork says it's "not yet implemented".
A lot of those more obscure docs have never been updated to reflect the current state of play unfortunately.
With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.