About Watchdog(Hardware and Software)

Our customer request watchdog processing of hardware and software of RB433GL.
In my knowledge, ping watchdog is software watchdog.

How hardware watchdog processing?
Hardware watchdog also need some setting? if yes, let me know how to do.

just enable watchdog. no more need to set annyting.

if u want ping watchdog, ping.

Its still possible to have a hanging unit. I have used remote controlled UPS and or power sources to get one more option to boot system. GSM to power module is a nice thing.

my question is,

How hardware watchdog works?
wish to know detail about the “hardware” for wathcodog function.
And how different with software watchdog

http://wiki.mikrotik.com/wiki/Manual:System/Watchdog