Determining Shader Constants

[PumpkinPieman]

Is there a few functions burried in the API that allow
A) Querying the current or maximum shader model available
B) Determining the maximum amount of registers for both vertex and pixel shaders given a current Shader Model.

Thanks.

[PumpkinPieman]

Alright I found the IVideoDriver->queryFeature function, which solves A. (I'm surprised I missed that.)
Now, if what is displayed on MSDN in SM const reg mins is the same across API's. Then I've solved B.