<s>
In	O
distributed	B-Architecture
programming	I-Architecture
,	O
a	O
portable	B-Operating_System
object	I-Operating_System
is	O
an	O
object	O
which	O
can	O
be	O
accessed	O
through	O
a	O
normal	O
method	B-Language
call	I-Language
while	O
possibly	O
residing	O
in	O
memory	O
on	O
another	O
computer	O
.	O
</s>
<s>
It	O
is	O
portable	O
in	O
the	O
sense	O
that	O
it	O
moves	O
from	O
machine	O
to	O
machine	O
,	O
irrespective	O
of	O
operating	B-General_Concept
system	I-General_Concept
or	O
computer	B-General_Concept
architecture	I-General_Concept
.	O
</s>
<s>
This	O
mobility	O
is	O
the	O
end	O
goal	O
of	O
many	O
remote	B-Operating_System
procedure	I-Operating_System
call	I-Operating_System
systems	O
.	O
</s>
<s>
The	O
advantage	O
of	O
portable	B-Operating_System
objects	I-Operating_System
is	O
that	O
they	O
are	O
easy	O
to	O
use	O
and	O
very	O
expressive	B-Language
,	O
allowing	O
programmers	B-Application
to	O
be	O
completely	O
unaware	O
that	O
objects	O
reside	O
in	O
other	O
locations	O
.	O
</s>
<s>
Detractors	O
cite	O
this	O
as	O
a	O
fault	O
,	O
as	O
naïve	O
programmers	B-Application
will	O
not	O
expect	O
network-related	B-Architecture
errors	O
or	O
the	O
unbounded	B-Application
nondeterminism	I-Application
associated	O
with	O
large	O
networks	O
.	O
</s>
