Benjamin Dover writes:

Here's one he posted today in VATSIM in response to someone who pointed out
that in trains is a "dead man's" button which, if controls are not touched
every few minutes, set off an alarm. Said Anthony, "Aircraft have this,
too, at least in real life, although it doesn't seem to be simulated, at
least not by PMDG." He really doesn't know **** from shinola.

The 747-400 has three levels of alarm. All appear as PILOT RESPONSE on the
EICAS, the first being an advisory without an audible alarm, the second a
caution with a beeper, and the third a warning with a siren. The 777 (at
least, not sure about others) also has this alarm, and I presume it works in
much the same way. I'm sure it's configurable by operators.