The Archicad menu

Item	Effect
Sync to Blender	Connects to Blender if needed, sends every element in the 3D model on a visible layer, then turns live sync on unless Live Sync is unchecked.
Disconnect from Blender	Stops live sync and closes the connection. The synced objects stay in Blender.
Live Sync	Checkable, on by default, remembered for the Archicad session. Unchecked: edits are not sent and the connection stays open. Checked again: one pass re-checks the model.
Licence...	Shows the licence and activates a key, an activation code, a Superhive order or a free trial. See section 3.

Progress and problems are written to Archicad's Report window.