When they're talking about how to get home, Vala says that they didn't have to worry because when they didn't check in, Landry would just dial in and they could tell him to send a naquada (sp?) generator and a laptop with a dialing program.
Why the hell would they ask for a laptop? Couldn't they just walk through (after informing Landry of the situation of course) since it's an open wormhole enabling them to communicate with Earth? Or if it's the wrong type of wormhole, they could just tell Landry to dial a 'regular' wormhole and they can just walk through.
What am I missing here?