<s>
MTCS	B-Application
(	O
Minimum	O
Teleprocessing	O
Communications	O
System	O
)	O
was	O
a	O
transaction	B-General_Concept
processor	I-General_Concept
that	O
ran	O
on	O
IBM	B-Device
mainframe	I-Device
systems	O
under	O
OS/VS1	B-Application
and	O
DOS/VS	B-Application
.	O
</s>
<s>
MTCS	B-Application
was	O
available	O
from	O
IBM	O
and	O
designed	O
for	O
rapid	O
,	O
low	O
to	O
medium-volume	O
online	O
processing	O
.	O
</s>
<s>
This	O
process	O
was	O
entirely	O
interactive	O
(	O
screen-oriented	O
using	O
3270	B-Operating_System
display	O
terminals	O
)	O
.	O
</s>
<s>
The	O
'	O
official	O
 '	O
version	O
of	O
MTCS	B-Application
was	O
a	O
single	B-Operating_System
thread	I-Operating_System
only	O
and	O
was	O
a	O
forerunner	O
of	O
CICS	B-Application
before	O
it	O
was	O
released	O
.	O
</s>
<s>
An	O
unofficial	O
and	O
multi-threaded	B-Operating_System
version	O
of	O
MTCS	B-Application
was	O
developed	O
by	O
Littlewoods	O
Pools	O
,	O
UK	O
at	O
the	O
same	O
time	O
as	O
a	O
multi-threaded	B-Operating_System
"	O
MTCS	B-Application
bridge	O
"	O
(	O
middleware	B-General_Concept
MTCS	B-Application
simulator	O
)	O
became	O
available	O
for	O
running	O
MTCS	B-Application
transactions	O
directly	O
under	O
CICS	B-Application
.	O
</s>
<s>
An	O
MTCS	B-Application
transaction	O
is	O
a	O
set	O
of	O
operations	O
which	O
together	O
perform	O
a	O
task	O
.	O
</s>
<s>
MTCS	B-Application
applications	O
comprise	O
transactions	O
which	O
were	O
written	O
in	O
IBM	B-Device
Basic	I-Device
Assembly	I-Device
Language	I-Device
and	O
interfaced	O
with	O
3270	B-Operating_System
terminals	I-Operating_System
.	O
</s>
<s>
Each	O
MTCS	B-Application
program	O
was	O
initiated	O
using	O
a	O
transaction	O
identifier	O
.	O
</s>
<s>
MTCS	B-Application
screens	O
were	O
sent	O
as	O
native	O
3270	B-Operating_System
datastreams	O
to	O
the	O
terminal	O
.	O
</s>
<s>
The	O
first	O
release	O
of	O
MTCS	B-Application
was	O
made	O
available	O
prior	O
to	O
the	O
first	O
release	O
of	O
CICS	B-Application
in	O
the	O
late	O
1960s	O
.	O
</s>
