<s>
DOCS	B-Application
(	O
Display	O
Operator	O
Console	O
Support	O
)	O
was	O
a	O
software	O
package	O
for	O
IBM	O
mainframes	B-Architecture
by	O
CFS	O
Inc.	O
,	O
enabling	O
access	O
to	O
the	O
system	O
console	O
using	O
3270-compatible	O
terminals	O
.	O
</s>
<s>
Computer	O
operators	O
communicated	O
with	O
IBM	O
mainframe	B-Architecture
computers	I-Architecture
using	O
an	O
electro-mechanical	O
typewriter-like	O
console	O
that	O
came	O
standard	O
on	O
most	O
IBM	O
360	O
and	O
370	O
computer	O
,	O
except	O
a	O
few	O
upper	O
end	O
models	O
that	O
offered	O
video	O
consoles	O
and	O
the	O
Model	O
20	O
which	O
came	O
standard	O
without	O
a	O
console	O
.	O
</s>
<s>
The	O
Selectric	O
was	O
a	O
major	O
step	O
up	O
from	O
the	O
teletypes	O
(	O
TTY	O
)	O
associated	O
with	O
Unix	B-Application
and	O
smaller	O
systems	O
,	O
but	O
still	O
clunky	O
.	O
</s>
<s>
The	O
video	O
consoles	O
provided	O
with	O
certain	O
models	O
were	O
not	O
considered	O
particularly	O
user	O
friendly	O
,	O
and	O
they	O
ignored	O
two	O
thirds	O
of	O
IBM	O
's	O
mainframe	B-Architecture
market	O
,	O
DOS	B-Device
and	O
its	O
VSE	B-Application
descendants	O
.	O
</s>
<s>
DOCS	B-Application
replaced	O
or	O
supplanted	O
the	O
typewriter	O
interface	B-Application
with	O
a	O
video	O
screen	O
.	O
</s>
<s>
In	O
practice	O
,	O
it	O
worked	O
a	O
little	O
like	O
present-day	O
instant	O
messenger	O
programs	O
(	O
ICQ	B-Protocol
,	O
QQ	B-Operating_System
,	O
AIM	B-Protocol
,	O
Adium	B-Protocol
,	O
iChat	B-Protocol
,	O
etc	O
.	O
</s>
<s>
DOCS	B-Application
was	O
available	O
for	O
DOS	B-Device
,	O
DOS/VS	B-Application
,	O
DOS/VSE	B-Application
,	O
and	O
came	O
packaged	O
with	O
third	O
party	O
operating	O
systems	O
,	O
such	O
as	O
EDOS	B-Application
from	O
The	B-Application
Computer	I-Application
Software	I-Application
Company	I-Application
,	O
later	O
acquired	O
by	O
Nixdorf	O
.	O
</s>
<s>
The	O
product	O
ran	O
under	O
several	O
DOS-related	O
platforms	O
:	O
</s>
<s>
Several	O
vendors	O
offered	O
DOCS	B-Application
as	O
part	O
of	O
their	O
OS	O
:	O
</s>
<s>
DOCS	B-Application
was	O
developed	O
by	O
CFS	O
,	O
Inc	O
.	O
of	O
Brookline	O
,	O
Massachusetts	O
at	O
the	O
Kayser-Roth	O
data	B-Operating_System
center	I-Operating_System
in	O
Whitman	O
,	O
Massachusetts	O
.	O
</s>
<s>
Dick	O
Goran	O
wrote	O
the	O
video	O
interface	B-Application
.	O
</s>
<s>
Leigh	O
Lundin	O
wrote	O
the	O
operating	O
system	O
interface	B-Application
and	O
transcript	O
recorder	O
.	O
</s>
<s>
DOCS	B-Application
required	O
a	O
dedicated	O
partition	O
.	O
</s>
<s>
With	O
DOS	B-Device
having	O
only	O
three	O
partitions	O
and	O
DOS/VS	B-Application
seven	O
,	O
giving	O
up	O
a	O
partition	O
to	O
DOCS	B-Application
placed	O
a	O
crimp	O
in	O
practicability	O
.	O
</s>
<s>
Fx	O
appeared	O
in	O
the	O
DOS/VS	B-Application
version	O
of	O
SDI	O
's	O
Grasp	O
as	O
F0	O
.	O
</s>
<s>
DOCS	B-Application
was	O
sold	O
in	O
North	O
America	O
by	O
CFS	O
,	O
Inc	O
,	O
Brookline	O
,	O
Ma	O
.	O
</s>
<s>
The	O
product	O
was	O
also	O
embedded	O
in	O
third	O
party	O
operating	O
system	O
packages	O
,	O
such	O
as	O
EDOS	B-Application
and	O
vDOS	O
.	O
</s>
