cutLoadPGMub ?

I trace the project code ~ “SobelFilter”…
It has a function " cutLoadPGMub() "
I know what the function do , but I have no idea where it’s from?
So…I want to understand ~
“Which lib this function correlated with ?”
"Where can I find the meaning about cut_function "…Thanks!! :))

cut* functions are part of the SDK you can find them in cutil.h

this can be found in $CUDA_SDK/common/inc this is on a linux machine but I think its the same on a windows machine.