>1. one of pic pin I always used it as power led and thru
>   any available timer I turn it on and off (fast enough that
>   you can see it) the purpose of this is:
>   if the pic crashed for any reason remotely you can tell if the
>   pic is alive or dead.

Often known as a "heartbeat indicator" :)

>2. if I want to check any subroutine to see if it is getting
>   there or not beginning of subroutine I turn it on and of it
>   I turn it off.

This can be a very neat trick, especially for determining just how long you
chip is spending inside an interrupt routine. I used this method with a
multichannel scope and multiple pins when debugging an I2C routine so I
could see just when things were happening in relation to the serial data
stream. Gives a very quick and relevant indication of what is happening.

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