[Lux]

Remember to keep in mind, left 4 dead 1/2 on steam does not officially support split screen, only left 4 dead 1/2 on xbox360 supports it.

EDIT:
Should beable to sdkcall this function CBasePlayer::IsSplitScreenPlayer, or read the offset directly with LoadFromAddress.

Offset in the client.
Windows offset: 9069
Linux offset: 9065

should be uint 8.

Not sure if this is the real offset or not may need padding.