[erlang-questions] What is the function be defined as BIF?

[LUKE]

I found that i lose some word in the code.

start(Name,Mod)->register(Name,spawn(fun()->loop(Name,Mod,Mod:init()) end)).

But

Why  the code can be compile?
start(Name,Mod)->erlang:register(spawn(fun()->loop(Name,Mod,Mod:init()) end)).


  ----- Original Message ----- 
  From: LUKE 
  To: erlang-questions@REDACTED 
  Sent: Tuesday, November 27, 2007 2:50 PM
  Subject: What is the function be defined as BIF?


  -module(genserver).
  -export([start/2,rpc/2]).

  start(Name,Mod)->register(spawn(fun()->loop(Name,Mod,Mod:init()) end)).
  ....

  Eshell V5.5.5  (abort with ^G)
  ...
  9>c(genserver).
  ./genserver.erl:4: function register/1 undefined

  --
  modify the register to  erlang:register
  start(Name,Mod)->erlang:register(spawn(fun()->loop(Name,Mod,Mod:init()) end)).
  --

  10> c(genserver).
  {ok,genserver}

  The register function is BIF ? 
  And the spawn function is BIF? 
  All of erlang:* is BIF?
  When we need specify a prefix erlang:* ?
  Why the most of example does not using erlang:register?


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