This policy setting allows users to enable authentication options that require user input from the pre-boot environment even if the platform indicates lack of pre-boot input capability. The Windows on-screen touch keyboard (such as used by slates) is not available in the pre-boot environment where BitLocker requires additional information such as a PIN or Password. It is recommended that administrators enable this policy only for devices that are verified to have an alternative means of pre-boot input (such as by attaching a USB keyboard). Note: that if this option is not enabled, options in the Require additional authentication at startup policy may not be available on such devices. These options include: - Configure TPM startup PIN: Required/Allowed - Configure TPM startup key and PIN: Required/Allowed - Configure use of passwords for operating system drives. Counter Measure: Enable this policy setting for computers that support alternative means of pre-boot input. Potential Impact: Users will be required to authenticate in order to boot computers that rely primarily on touch keyboards, if they do not have access to a USB keyboard or other alternative means to enter their PIN or password they will be unable to boot the system. Fix: (1) GPO: Computer Configuration\Administrative Templates\Windows Components\BitLocker Drive Encryption\Operating System Drives\Enable use of BitLocker authentication requiring preboot keyboard input on slates (2) REG: HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\FVE!OSEnablePrebootInputProtectorsOnSlates