If the Automatic save changes to a file is enabled all changes made to the current hosts configuration is saved to the known filename. If it's enabled and you start a new set of hosts, you will be prompted for a filename when you quit Servers Alive.
If Load Window positions at startup is enabled, Servers Alive will restore the last position on screen it had and also restore itself to the last-know size it had on screen.
The Check times grid is used to know every x minutes Servers Alive will start checking your list of hosts.
If the value is 0 (zero) than no checking will be done in that time period.
(Note : Saturday 6pm to 8am means from Saturday 6pm to Sunday 8am - same logic for all others)