

"We turned it off for the demo because we didn't want to have to deal with any additional bug reports etc. However, we are planning on making some of the functionality work on the PC as an unsupported bonus feature," said Valve designer Yahrn Beriner on the Steam forums.

"Split-screen was always something we only wanted to officially support on the x360 due to the controller issues. Valve has patched the PC demo of Left 4 Dead to remove split-screen play, which could be activated by plugging in an Xbox 360 controller and typing a short console command.
