Once activated, can you get it to fire where ever you want once a day?

Which is the best option at the mainframe?

Is there a trick to use two of the options?

Well the BEST option in my opinion would be to redirect the power to Freeside of spread it evenly across the grid. Honestly, I'd rather give people power over a orbital laser.

You can't use both options, it's either kill the NCR troops outside with the laser, or give others power. You can fire the laser anywhere as long as it's outside, AND you have to get the laser aimer from the kid running around freeside chasing the girl with his gun.

From what I remember, I spread the power and I still got to kill the NCR troops with the defense system...Did I do something wrong? I made a save right in front of the computer just in case.
I don't like the NCR. The only people I have respect for in the game are the Boomers.

If you activate the security grid, it launches and kills them all. Also if you tap the emergency power output one, it fries the circuits there, so it doesnt send power or fires the laser.

You dont have to activate defenses (that will kill the troops outside), that is optional.

As for the options, its pretty much who do you want to have rep with but it does play a role with a companion quest if you want to use the laser.

Just a thought.....what if you activated the ARCH II, (remember, the kid has the gun) and the kid shoots the gun at the girl, what if he shot the orbital laser at a person in Freeside?
But, how could a kid be holding a 15 pound gun, running around?
And, the girl would not die from the laser, because kids can not die.

No, when you activate the ARCH II, the laser automatically fires on the solar panels outside, killing the soldiers, you saw the trailer 5 months ago, right?

That is the defenses, its OPTIONAL as I diverted power to the Laser and did not activated the defenses (well, I did just to see what happened and then reloaded).
You DONT have to activate the defenses, the "Arm ARCHIMEDES Plant Defense System" option is made available no matter what option you pick when diverting power (even if you pick Emergency Output Level, just that will not work for the obvious reason).

http://fallout.wikia.com/wiki/That_Lucky_Old_Sun

Can you clarify more on this please?

The safety is on, Veronica comments on it.