[Pacemaker] Corosync or Hearbeat or both ?

[José Pablo Méndez Soto]

Hi, I am recently starting to poke around with Pacemaker. Can someone please
explain what is the difference between Corosync and Heartbeat, when would
you use one or when the other? And why would you have corosync installed
accoring to this howto, if Heartbeat is to be the preferred method? (the
reason besides being a dependency):

http://clusterlabs.org/wiki/Debian_Lenny_HowTo

 *José Pablo Méndez
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