Version Token
A version token describes the version number of the shader code and informs the driver whether the shader code is for a pixel or vertex shader. The version token is composed of the following bits:
Bits
[07:00] Bits 0 through 7 indicate the minor version number or the code.
[15:08] Bits 8 through 15 specify the major version number or the code.
[31:16] Bits 16 through 31 specify whether the code is for a pixel or vertex shader. For a pixel shader, the value is 0xFFFF. For a vertex shader, the value is 0xFFFE.
Requirements
Available in Windows Vista and later versions of the Windows operating systems.