Spin2 OBJ declaration in FlexGUI

in Propeller 2
Brand new to the Propeller 2 and its SPIN2 programming but I have programmed the Propeller 1 with SPIN. I have loaded the FlexGUI and I see in a spin2 example the notation:
What does the
obj ser: "spin/SmartSerial"
What does the
spin/portion of the declaration indicate? Thanks.
Comments
I'll update the version in the next distribution.