An arbitrary header key that will be used for tracking
users in the web application. Change this value to
not make it to easy for any attacker to try to bypass
security
Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2