[igraph] Random number generator(RNG) question

[Richard Geddes]

Hello,

I'm interested in using the random network generating functions in the
igraph library.  I assume a RNG is used in these functions.  My studies
tell me that not all RNG's are the same.. some more random than others. 
I was wondering if someone could either give a summary of the igraph RNG
or point me to some info that describes the methodologies used in the
igraph RNG. 

Also can the igraph RNG generate 64-bit random numbers for 64-bit
environments?

Thank you
Richard