What "squid -krestart" should do?

[Eliezer Croitoru]

I have tried to use "squid -krestart" to replace a script which depends 
on the existence of a PID.
The results was weird enough that there was still a PID and squid was 
not running which is similar to "squid -k shut".

So, What "squid -krestart" should do?
Thanks,
Eliezer