<s>
Distributed	O
Processing	O
Programming	O
Executive	O
is	O
a	O
discontinued	O
operating	B-General_Concept
system	I-General_Concept
introduced	O
by	O
IBM	O
,	O
pre-installed	O
on	O
the	O
IBM	B-Device
8100	I-Device
and	O
later	O
ported	O
to	O
the	O
ES/9370	B-Device
.	O
</s>
<s>
It	O
was	O
first	O
introduced	O
on	O
the	O
IBM	B-Device
8100	I-Device
series	O
,	O
which	O
was	O
released	O
in	O
1978	O
.	O
</s>
<s>
In	O
1986	O
,	O
IBM	O
decided	O
to	O
cease	O
the	O
IBM	B-Device
8100	I-Device
architecture	O
to	O
consolidate	O
its	O
hardware	O
and	O
software	O
families	O
.	O
</s>
<s>
In	O
1988	O
,	O
they	O
released	O
DPPX/370	O
which	O
ran	O
on	O
the	O
ES/9370	B-Device
processors	O
(	O
an	O
S/370	B-Device
model	O
)	O
.	O
</s>
<s>
DPPX	O
was	O
written	O
in	O
Programming	O
Language	O
for	O
Distributed	O
Systems	O
(	O
PL/DS	O
)	O
,	O
a	O
PL/I	B-Language
-derived	O
systems	O
programming	O
language	O
,	O
similar	O
to	O
the	O
PL/S	B-Language
systems	O
programming	O
language	O
used	O
for	O
MVS	B-Application
and	O
VM	B-Application
.	O
</s>
<s>
(	O
PL/DS	O
,	O
like	O
PL/S	B-Language
,	O
is	O
a	O
high-level	O
language	O
which	O
encourages	O
significant	O
use	O
of	O
inline	O
assembly	O
.	O
)	O
</s>
<s>
The	O
user	O
interfaces	O
(	O
e.g.	O
,	O
command	B-Application
line	I-Application
)	O
of	O
DPPX	O
were	O
very	O
clean	O
and	O
easy	O
to	O
use	O
,	O
the	O
syntax	O
of	O
the	O
commands	O
,	O
the	O
whole	O
concept	O
and	O
ideas	O
of	O
DPPX	O
looked	O
very	O
straightforward	O
and	O
consistent	O
(	O
command	B-Application
line	I-Application
,	O
online	O
help	O
,	O
etc	O
.	O
</s>
<s>
One	O
benefit	O
of	O
this	O
clean	O
design	O
was	O
that	O
programs	O
could	O
be	O
written	O
in	O
modern	O
dialects	O
of	O
COBOL	B-Application
,	O
and	O
dialogs	O
could	O
be	O
developed	O
interactively	O
.	O
</s>
<s>
In	O
addition	O
to	O
the	O
expected	O
functions	O
of	O
an	O
operating	B-General_Concept
system	I-General_Concept
,	O
DPPX	O
included	O
several	O
functions	O
which	O
allowed	O
for	O
remote	O
administration	O
,	O
such	O
as	O
Distributed	O
Host	O
Command	O
Facility	O
(	O
DHCF	O
)	O
,	O
which	O
allowed	O
a	O
Host	O
Command	O
Facility	O
(	O
HCF	O
)	O
user	O
on	O
a	O
mainframe	O
to	O
log	O
on	O
in	O
either	O
full-screen	O
mode	O
or	O
line	B-Application
mode	I-Application
to	O
execute	O
commands	O
as	O
though	O
logged	O
on	O
locally	O
,	O
and	O
Distributed	O
Systems	O
Network	O
(	O
or	O
Node	O
)	O
Executive	O
(	O
DSNX	O
)	O
,	O
which	O
allowed	O
a	O
Distributed	O
Systems	O
Executive	O
(	O
DSX	O
)	O
(	O
later	O
NetView/DM	O
)	O
job	O
to	O
manage	O
files	O
.	O
</s>
<s>
Separate	O
additional	O
products	O
were	O
also	O
available	O
,	O
including	O
COBOL	B-Application
and	O
Fortran	B-Application
compilers	O
,	O
the	O
Distributed	O
Transaction	O
Management	O
System	O
(	O
DTMS	O
)	O
,	O
Command	O
Facilities	O
Extensions	O
(	O
CFE	O
)	O
,	O
which	O
provided	O
easy	O
support	O
for	O
full-screen	O
applications	O
,	O
Data	O
Stream	O
Capability	O
(	O
DSC	O
)	O
to	O
allow	O
DPPX	O
users	O
to	O
log	O
on	O
to	O
applications	O
on	O
the	O
mainframe	O
,	O
and	O
Performance	O
Tool	O
(	O
PT	O
)	O
.	O
</s>
