<s>
A	O
service	B-Language
wrapper	I-Language
is	O
a	O
computer	B-Application
program	I-Application
that	O
wraps	O
arbitrary	O
programs	O
thus	O
enabling	O
them	O
to	O
be	O
installed	O
and	O
run	O
as	O
Windows	O
Services	O
or	O
Unix	B-Operating_System
daemons	I-Operating_System
,	O
programs	O
that	O
run	O
in	O
the	O
background	B-Operating_System
,	O
rather	O
than	O
under	O
the	O
direct	O
control	O
of	O
a	O
user	O
.	O
</s>
<s>
They	O
are	O
often	O
automatically	O
started	O
at	O
boot	B-Operating_System
time	I-Operating_System
.	O
</s>
<s>
Arbitrary	O
programs	O
cannot	O
run	O
as	O
services	O
or	O
daemons	B-Operating_System
,	O
unless	O
they	O
fulfil	O
specific	O
requirements	O
which	O
depend	O
on	O
the	O
operating	B-General_Concept
system	I-General_Concept
.	O
</s>
<s>
They	O
also	O
have	O
to	O
be	O
installed	O
in	O
order	O
for	O
the	O
operating	B-General_Concept
system	I-General_Concept
to	O
identify	O
them	O
as	O
such	O
.	O
</s>
<s>
Various	O
projects	O
exist	O
offering	O
a	O
Java	B-Language
service	I-Language
wrapper	I-Language
,	O
as	O
Java	B-Device
itself	O
does	O
n't	O
support	O
creating	O
system	O
services	O
.	O
</s>
