SGP doesn't "know" anything 
It simply issues commands to the ASCOM
driver (GeminiTelescope.net in your case). When SGP completes the sequence
it simply issues a park command to Gemini2. So wherever the park position
is set in GeminiTelescope.net is where the mount will park.
As far as start up goes, here's what I do:
1. Connect the mount and if necessary unpark from the ascom driver
2. Slew somewhere in the sky away from the pole (either with a planetarium
program or with the on screen GeminiTelescope.net control)
3. "Solve and Sync" the mount.
At that point you should be good to go.