Matrix Headaches Options

[Degausser]

Okay, I am SURE this question has been posted before, but searching through 13 pages of threads isn't my idea of fun. And hey, it says this is the forum for discussing game rules.

I am planning on starting to GM Shadowrun soon, and I am trying to nail down all the rules so that when my PCs throw oddball curves at me, I can come back and at least know the core rules.

Unfortunatly, I can't quite figure out Matrix stuff. Magic and combat and all that I got down, just not the Matrix stuff.

Okay, you you have your comlink, which connects to a maximum of (2x Comlink's system rating) worth of devices, as well as the Matrix as a whole. So it controls your smartlinked gun and your smart glasses, and the doberman drone, yadda yadda. great, I got all of that. Running on various modes like active, passive, hidden, got that.

What I don't got is hacking. Let's say you want to hack into a system and open a door.

If I am reading the rules right, you roll (Hacking skill + Exploit Program)Against Threshold (Enemy Firewall) to gain access to a facility's LAN, and they roll (Analyse+firewall) Against Threshold (your Stealth) to detect you. Once in, you Run (Computer + Analyse) to find that door, then (Hacking+Command) to open the door.

Is this right? Do they NEED Command to open a door? Does the door get to resist my 'Command?'

If My buddy is piloting a drone, and I want to gun for him, Do I have to have the COMMAND program to do gunnery?

Also, if the above is true, then the two sample hackers in the book (The ork and the technomancer) must be the worst hackers ever, because neither of them have the explot program! Can they 'Default' by just rolling their hacking skill?