RDRAND is an instruction to return random number from new Intel CPUs. This is NIST SP 800-90A compliant random number generator and now this instruction is a part of IA-32/IA-64 instruction sets. RdRand instruction is available from 3rd generation Intel Core i5 and Core i7 processors.
RdRandLib is lightweight DLL to generate random numbers based on RdRand instruction. This library contain signal function to generate one or many random numbers and sample codes are available for C/C++, Delphi, Lazarus and C# languages.