Surface Symbol Type
The surface symbol type is used to store the reference number of a surface. If the surface's value
is passed from a JKL, any messages sent by the surface will be received by the symbol's cog. Syntax:
surface surf1
Mask Info: Surfaces can send several messages to their cogs. Giving the surface
Mask Flags
allows the cog to ignore messages from the surface caused by things that were
excluded by the mask. Surfaces also use default masks, perhaps 0x400.