Brian Barjenbruch wrote:

> > Well, "SG-1" doesn't allow for two-way traffic - the probe can send
> > back images, but it can't get back by itself. No physical object can
> > travel "upstream" in the stargates.
>
> Then how can anyone ever get back home?

The SG personnel simply use the "Dial Home Device" to open the Stargate
back to Earth.