Solaris MC and Sun Cluster?

Could someone tell me the relationship between Solaris MC and Sun Cluster?
Thanks!
Bill

Solaris MC is a distributed operating system for
multi-computers (i.e., clusters of nodes) that provides a
single-system image: a cluster appears to the user and applications
as a single computer running the SolarisTM operating system. Solaris
MC is built as a set of extensions to the base Solaris UNIX � system
and provides the same ABI/API as Solaris, running unmodified
applications. The components of Solaris MC are implemented in C++
through a CORBA-compliant object-oriented system with all new services
defined by the IDL definition language. Objects communicate through a
runtime system that borrows from Solaris doors and Spring
subcontracts. Solaris MC is designed for high availability: if a node
fails, the remaining nodes remain operational. Solaris MC has a
distributed caching file system with UNIX consistency semantics,
based on the Spring virtual memory and file system architecture.
Process operations are extended across the cluster, including remote
process execution and a global /proc file system. The external network
is transparently accessible from any node in the cluster.

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system SUNWesu Extended System Utilities
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