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RPC：
Remote procedure call (RPC) is an
Inter-process communication technology
that allows a computer program to
cause a subroutine or procedure to
execute in another address space
(commonly on another computer on a
shared network) without the programmer
explicitly coding the details for this
remote interaction.
IPC：
Inter-process communication (IPC) is a
set of techniques for the exchange of
data among multiple threads in one or
more processes. Processes may be
running on one or more computers
connected by a network.
所以，RPC只是一种IPC。