<s>
Software	B-Device
Distributor	I-Device
(	O
SD	O
)	O
is	O
the	O
Hewlett-Packard	O
company	O
's	O
name	O
for	O
their	O
HP-UX	B-Application
software	B-Application
package	I-Application
management	I-Application
system	O
.	O
</s>
<s>
SD	O
provides	O
a	O
set	O
of	O
tools	O
for	O
creating	O
packages	O
that	O
will	O
install	O
software	O
on	O
a	O
system	O
running	O
the	O
HP-UX	B-Application
operating	O
system	O
.	O
</s>
<s>
The	O
packages	O
can	O
be	O
grouped	O
together	O
into	O
a	O
software	B-Application
repository	I-Application
called	O
a	O
depot	O
,	O
and	O
a	O
server	O
can	O
be	O
configured	O
to	O
host	O
multiple	O
depots	O
for	O
installation	B-Application
of	O
software	B-Application
packages	I-Application
and	O
even	O
entire	O
systems	O
.	O
</s>
<s>
SD	O
was	O
first	O
available	O
with	O
release	O
10.0	O
of	O
HP-UX	B-Application
in	O
1995	O
.	O
</s>
<s>
Since	O
then	O
it	O
has	O
undergone	O
several	O
enhancements	O
and	O
bug	O
fixes	O
,	O
and	O
now	O
provides	O
a	O
reliable	O
software	B-Application
installation	I-Application
tool	O
.	O
</s>
<s>
It	O
uses	O
a	O
client-server	O
arrangement	O
to	O
distribute	O
software	O
using	O
a	O
background	O
daemon	B-Operating_System
called	O
.	O
</s>
<s>
This	O
agent	O
is	O
started	O
at	O
boot	O
time	O
,	O
and	O
communicates	O
using	O
either	O
the	O
TCP	O
or	O
UDP	O
protocols	O
through	O
RPC	B-Operating_System
.	O
</s>
<s>
configure	O
or	O
unconfigure	O
an	O
installed	O
software	B-Application
package	I-Application
.	O
</s>
<s>
copy	O
software	B-Application
packages	I-Application
to	O
a	O
depot	O
.	O
</s>
<s>
modify	O
the	O
particulars	O
of	O
a	O
software	B-Application
package	I-Application
installed	O
on	O
a	O
system	O
or	O
loaded	O
into	O
a	O
depot	O
.	O
</s>
<s>
a	O
specification	O
file	O
is	O
passed	O
to	O
this	O
command	O
,	O
directing	O
it	O
about	O
how	O
a	O
software	B-Application
package	I-Application
should	O
be	O
built	O
.	O
</s>
<s>
remove	O
a	O
software	B-Application
package	I-Application
from	O
a	O
system	O
or	O
depot	O
.	O
</s>
<s>
In	O
addition	O
to	O
command-line	O
programs	O
,	O
several	O
of	O
these	O
tools	O
can	O
also	O
launch	O
GUI	B-Application
versions	O
in	O
an	O
X	B-Operating_System
Window	I-Operating_System
System	I-Operating_System
display	O
.	O
</s>
<s>
The	O
GUI	B-Application
version	O
of	O
performs	O
some	O
filtering	O
of	O
the	O
software	O
list	O
to	O
match	O
software	B-Application
packages	I-Application
with	O
the	O
system	O
where	O
it	O
is	O
being	O
run	O
.	O
</s>
<s>
The	O
commands	O
log	O
messages	O
to	O
an	O
administrative	O
area	O
,	O
which	O
can	O
be	O
useful	O
for	O
diagnosing	O
installation	B-Application
issues	O
or	O
just	O
tracking	O
what	O
software	O
is	O
loaded	O
or	O
removed	O
.	O
</s>
<s>
Software	B-Application
packages	I-Application
are	O
built	O
by	O
means	O
of	O
a	O
specification	O
file	O
,	O
a	O
set	O
of	O
install	O
scripts	O
,	O
and	O
the	O
actual	O
software	O
content	O
.	O
</s>
<s>
The	O
install	O
scripts	O
are	O
executed	O
during	O
software	B-Application
installation	I-Application
,	O
verification	O
,	O
and	O
removal	O
,	O
and	O
can	O
be	O
used	O
to	O
prepare	O
a	O
system	O
for	O
the	O
software	O
and	O
to	O
perform	O
activation	O
or	O
deactivation	O
of	O
the	O
package	O
.	O
</s>
<s>
The	O
specification	O
file	O
determines	O
how	O
the	O
software	B-Application
package	I-Application
will	O
be	O
organized	O
,	O
list	O
the	O
locations	O
of	O
the	O
various	O
files	O
to	O
be	O
loaded	O
into	O
the	O
package	O
,	O
restrict	O
the	O
systems	O
on	O
which	O
the	O
package	O
can	O
be	O
installed	O
,	O
and	O
determine	O
the	O
security	O
configuration	O
of	O
the	O
package	O
.	O
</s>
<s>
Software	B-Application
packages	I-Application
are	O
organized	O
in	O
a	O
hierarchy	O
of	O
containers	O
,	O
with	O
the	O
highest	O
level	O
being	O
a	O
bundle	O
or	O
product	O
and	O
the	O
lowest	O
being	O
the	O
filesets	O
and	O
then	O
files	O
.	O
</s>
<s>
These	O
scripts	O
are	O
executed	O
in	O
the	O
following	O
order	O
during	O
an	O
installation	B-Application
:	O
</s>
<s>
All	O
,	O
some	O
,	O
or	O
none	O
of	O
these	O
scripts	O
can	O
be	O
included	O
in	O
the	O
package	O
,	O
depending	O
on	O
the	O
requirements	O
of	O
the	O
installation	B-Application
.	O
</s>
