Demo release details
Those who pre-order the game (at participating retailers or via Steam) will obtain early access to the demo on October 27. The demo will then be made available to Xbox LIVE Gold members and all PC gamers on November 3. Then all Xbox LIVE members will obtain access to the demo on November 10.

Coming exclusively to Xbox 360 and PC, L4D2 promises to set a new benchmark for co-operative action games and become one of 2009's marquee titles. Set for release on November 17, the title adds melee combat to enable deeper co-operative gameplay, with items such as a chainsaws, frying pans, axes, baseball bats, and more.
Demo details

System Requirements
  Minimum:

• Supported OS: Windows® 7 / Vista / Vista64 / XP
• Processor: Pentium 4 3.0GHz
• Memory: 1 GB for XP / 2GB for Vista
• Graphics: DirectX 9 compatible video card with 128 MB, Shader model 2.0. ATI X800, NVidia 6600 or better
• Hard Drive: At least 7.5 GB of free space
• Sound Card: DirectX 9.0c compatible sound card

  Recommended:

• Supported OS: Windows® 7 / Vista / Vista64 / XP
• Processor: Intel core 2 duo 2.4GHz
• Memory: 1 GB for XP / 2GB for Vista
• Graphics: DirectX 9 compatible video card with Shader model 3.0. NVidia 7600, ATI X1600 or better
• Hard Drive: At least 7.5 GB of free space
• Sound Card: DirectX 9.0c compatible sound card