Can someone explain the structure of a Pid (Process Identifier) in Erlang?

Printed process ids < A.B.C > are composed of 6: A, the node number (0 is the local node, an arbitrary number for a remote node) B, the first 15 bits of the process number (an index into the process table) 7 C, bits 16-18 of the process number (the same process number as B) 7 Internally, the process number is 28 bits wide on the 32 bit emulator. The odd definition of B and C comes from R9B and ear