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Conceptually,
to
communicate,
procedures
must
send
messages
to
one
another,
just
as
people
meet.
According
to
one
way,
procedures
talk
to
others
by
handing
them
some
values
and
receiving
some
values
in
return.
One
reasonable
name
for
this
method
of
communication
is
the
"private-line
method,"
since
only
the
calling
procedure
and
the
called
procedure
see
the
communication.
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