Anti-Ghosting

Keyboard Ghosting

And The SideWinder X4

Microsoft Hardware recently announced the release of the SideWinder X4 keyboard featuring new anti-ghosting technology. This keyboard allows gamers to press many keys at the same time and have them accurately reported. The documents linked below discuss the importance of this innovation.
Keyboard Ghosting Explained - Learn what keyboard ghosting is and what causes it.
Keyboard Ghosting Demonstration - Find out which key combinations work on your keyboard.
SideWinder X4 Anti-Ghosting FAQ - Read more about the capabilities of the SideWinder X4.