Unknown Functions - Please help

I am new to CUDA and now studying step by step. These days I am studying CUDA samples provided by NVIDIA. I found some functions from their source code which do not exists in CUDA specification. Can anyone say from where these came.

I have put some code samples which I do not understand. Please be kind enough to reply to this post.

// includes, project
#include <cutil_inline.h>

if( cutCheckCmdLineFlag(argc, (const char**)argv, “device”) )
cutilDeviceInit(argc, argv);

cutilCheckError( cutCreateTimer( &timer));
cutilCheckError( cutStartTimer( timer));