<s>
In	O
computer	B-General_Concept
programming	I-General_Concept
,	O
transient	B-Device
is	O
a	O
property	O
of	O
any	O
element	O
in	O
the	O
system	O
that	O
is	O
temporary	O
.	O
</s>
<s>
The	O
term	O
applies	O
to	O
transient	B-General_Concept
applications	I-General_Concept
,	O
i.e.	O
</s>
<s>
software	O
for	O
the	O
end-user	O
which	O
is	O
displayed	O
with	O
a	O
transient	B-General_Concept
application	I-General_Concept
posture	O
;	O
transient	B-Device
data	O
,	O
which	O
is	O
discarded	O
after	O
it	O
is	O
no	O
longer	O
needed	O
by	O
the	O
computation	O
;	O
and	O
transient	B-Device
code	O
which	O
are	O
subroutines	O
or	O
software	O
components	O
that	O
are	O
loaded	O
in	O
the	O
system	O
only	O
for	O
a	O
fraction	O
of	O
the	O
total	O
run	B-Library
time	I-Library
.	O
</s>
<s>
In	O
the	O
Java	B-Language
programming	I-Language
language	I-Language
,	O
transient	B-Device
is	O
a	O
keyword	B-Language
used	O
as	O
a	O
field	O
modifier	O
.	O
</s>
<s>
When	O
a	O
field	O
is	O
declared	O
transient	B-Device
,	O
it	O
would	O
not	O
be	O
serialized	B-Application
even	O
if	O
the	O
class	O
to	O
which	O
it	O
belongs	O
is	O
serialized	B-Application
.	O
</s>
<s>
In	O
Java	B-Language
,	O
methods	O
,	O
classes	O
and	O
interfaces	O
cannot	O
be	O
declared	O
as	O
transient	B-Device
,	O
because	O
they	O
are	O
never	O
serialized	B-Application
.	O
</s>
<s>
In	O
Hibernate	B-Library
and	O
other	O
persistence	O
systems	O
,	O
transient	B-Device
describes	O
an	O
object	O
that	O
has	O
been	O
instantiated	O
,	O
but	O
is	O
not	O
associated	O
with	O
a	O
Hibernate	B-Library
session	O
,	O
i.e.	O
</s>
<s>
the	O
object	O
resides	O
in	O
memory	B-General_Concept
but	O
is	O
not	O
being	O
persisted	O
.	O
</s>
<s>
In	O
the	O
X	B-Operating_System
Window	I-Operating_System
System	I-Operating_System
,	O
a	O
window	O
is	O
said	O
to	O
be	O
transient	B-Device
for	O
another	O
window	O
if	O
it	O
belongs	O
to	O
that	O
other	O
window	O
and	O
may	O
not	O
outlast	O
it	O
:	O
a	O
dialog	O
box	O
,	O
such	O
as	O
an	O
alert	O
message	O
,	O
is	O
a	O
common	O
example	O
.	O
</s>
<s>
This	O
should	O
not	O
be	O
confused	O
with	O
a	O
window	O
containing	O
another	O
window	O
:	O
contained	O
windows	O
lie	O
entirely	O
within	O
their	O
parents	O
,	O
but	O
transients	B-Device
are	O
separate	O
windows	O
which	O
can	O
generally	O
be	O
moved	O
freely	O
around	O
the	O
screen	O
.	O
</s>
<s>
Transient	B-Device
windows	O
may	O
be	O
treated	O
specially	O
by	O
the	O
window	B-Application
manager	I-Application
,	O
and	O
unlike	O
top-level	O
windows	O
(	O
which	O
can	O
require	O
user	O
placement	O
,	O
as	O
in	O
twm	B-Language
)	O
,	O
must	O
never	O
require	O
any	O
user	O
interaction	O
on	O
appearing	O
.	O
</s>
<s>
Transient	B-Device
also	O
refers	O
to	O
a	O
module	O
that	O
,	O
once	O
loaded	O
into	O
main	O
memory	B-General_Concept
,	O
is	O
expected	O
to	O
remain	O
in	O
memory	B-General_Concept
for	O
a	O
short	O
time	O
.	O
</s>
<s>
The	O
term	O
Overlay	B-General_Concept
is	O
commonly	O
used	O
instead	O
,	O
and	O
refer	O
to	O
a	O
program	O
module	O
that	O
is	O
brought	O
to	O
memory	B-General_Concept
when	O
it	O
is	O
needed	O
by	O
the	O
running	O
program	O
and	O
then	O
replaced	O
with	O
another	O
when	O
it	O
is	O
no	O
longer	O
needed	O
,	O
so	O
a	O
program	O
had	O
lower	O
memory	B-General_Concept
requirements	O
.	O
</s>
<s>
Program	O
modules	O
were	O
written	O
to	O
allow	O
different	O
modules	O
to	O
share	O
the	O
same	O
memory	B-General_Concept
region	O
and	O
the	O
main	O
program	O
itself	O
was	O
responsible	O
of	O
exchanging	O
modules	O
between	O
disk	O
and	O
memory	B-General_Concept
as	O
necessary	O
.	O
</s>
<s>
In	O
the	O
mid-to-late	O
1960s	O
,	O
mainframe	O
computers	O
,	O
such	O
as	O
the	O
IBM	B-Application
System/360	I-Application
,	O
had	O
memory	B-General_Concept
sizes	O
from	O
8	O
KB	O
to	O
512	O
KB	O
.	O
</s>
<s>
In	O
order	O
to	O
conserve	O
memory	B-General_Concept
,	O
transients	B-Device
were	O
small	O
modules	O
that	O
supported	O
a	O
specific	O
task	O
,	O
and	O
were	O
swapped	O
in	O
and	O
out	O
of	O
memory	B-General_Concept
.	O
</s>
<s>
The	O
concept	O
of	O
transient	B-Device
area	O
is	O
part	O
of	O
Mythical	O
Man-Month	O
'	O
s	O
discussion	O
on	O
design	O
and	O
the	O
use	O
of	O
main	O
memory	B-General_Concept
.	O
</s>
<s>
The	O
operating	O
system	O
for	O
the	O
S/360	B-Application
had	O
two	O
areas	O
reserved	O
for	O
transients	B-Device
that	O
supported	O
input/output	O
operations	O
.	O
</s>
<s>
These	O
were	O
referred	O
to	O
as	O
the	O
"	O
logical	O
transient	B-Device
area	O
"	O
and	O
the	O
"	O
physical	O
transient	B-Device
area.	O
"	O
</s>
<s>
If	O
an	O
application	O
program	O
,	O
for	O
example	O
,	O
needed	O
to	O
use	O
the	O
printer	O
,	O
transients	B-Device
that	O
supported	O
printing	O
were	O
brought	O
into	O
the	O
transient	B-Device
areas	O
.	O
</s>
<s>
If	O
an	O
application	O
needed	O
to	O
use	O
tape	O
drives	O
,	O
transients	B-Device
that	O
supported	O
tape	O
drive	O
access	O
were	O
brought	O
into	O
the	O
transient	B-Device
areas	O
.	O
</s>
<s>
The	O
IBM	B-Device
1130	I-Device
of	O
the	O
same	O
era	O
used	O
part	O
of	O
the	O
first	O
4K	O
of	O
memory	B-General_Concept
as	O
a	O
transient	B-Device
area	O
.	O
</s>
<s>
In	O
the	O
1980s	O
,	O
MS-DOS	B-Application
reloaded	O
the	O
transient	B-Device
portion	O
of	O
COMMAND.COM	O
between	O
programs	O
or	O
user	O
commands	O
.	O
</s>
<s>
At	O
the	O
level	O
of	O
message	B-Architecture
passing	I-Architecture
,	O
transient	B-Device
communication	O
means	O
the	O
way	O
by	O
which	O
the	O
messages	O
are	O
not	O
saved	O
into	O
a	O
buffer	O
to	O
wait	O
for	O
its	O
delivery	O
at	O
the	O
message	O
receiver	O
.	O
</s>
