<s>
Queued	B-Application
Telecommunications	I-Application
Access	I-Application
Method	I-Application
(	O
QTAM	B-Application
)	O
is	O
an	O
IBM	B-Application
System/360	I-Application
communications	O
access	B-Application
method	I-Application
incorporating	O
built-in	O
queuing	B-Operating_System
.	O
</s>
<s>
QTAM	B-Application
was	O
an	O
alternative	O
to	O
the	O
lower	O
level	O
Basic	B-Application
Telecommunications	I-Application
Access	I-Application
Method	I-Application
(	O
BTAM	B-Application
)	O
.	O
</s>
<s>
QTAM	B-Application
was	O
announced	O
by	O
IBM	O
in	O
1965	O
as	O
part	O
of	O
OS/360	B-Application
and	O
DOS/360	B-Application
aimed	O
at	O
inquiry	O
and	O
data	O
collection	O
.	O
</s>
<s>
As	O
announced	O
it	O
also	O
supported	O
remote	B-Protocol
job	I-Protocol
entry	I-Protocol
(	O
RJE	B-Protocol
)	O
applications	O
,	O
called	O
job	O
processing	O
,	O
which	O
was	O
dropped	O
by	O
1968	O
.	O
</s>
<s>
Originally	O
QTAM	B-Application
supported	O
the	O
IBM	B-Device
1030	I-Device
Data	O
Collection	O
System	O
,	O
IBM	B-Device
1050	I-Device
Data	O
Communications	O
System	O
,	O
the	O
IBM	O
1060	O
Data	O
Communications	O
System	O
,	O
the	O
IBM	O
2671	O
Paper	O
Tape	O
Reader	O
,	O
AT&T	O
83B2	O
Selective	O
Calling	O
Stations	O
,	O
Western	O
Union	O
Plan	O
115A	O
Outstations	O
,	O
and	O
AT&T	O
Teletype	B-Application
Model	I-Application
33	I-Application
or	O
35	O
Teletypewriters	O
.	O
</s>
<s>
By	O
1968	O
terminal	O
support	O
had	O
expanded	O
to	O
include	O
the	O
IBM	B-Device
2260	I-Device
display	O
complex	O
,	O
and	O
the	O
IBM	O
2740	O
communications	O
terminal	O
.	O
</s>
<s>
QTAM	B-Application
devices	O
were	O
attached	O
to	O
a	O
System/360	B-Application
multiplexor	O
channel	O
through	O
an	O
IBM	B-Device
2701	I-Device
Data	I-Device
Adapter	I-Device
or	O
IBM	B-Device
2702	I-Device
Transmission	I-Device
Control	I-Device
.	O
</s>
<s>
By	O
1968	O
support	O
for	O
the	O
IBM	B-Device
2703	I-Device
Transmission	I-Device
Control	I-Device
Unit	I-Device
had	O
been	O
added	O
.	O
</s>
<s>
QTAM	B-Application
was	O
succeeded	O
by	O
TCAM	B-Application
which	O
provided	O
roughly	O
similar	O
facilities	O
,	O
but	O
was	O
not	O
supported	O
under	O
DOS	O
.	O
</s>
<s>
QTAM	B-Application
consists	O
of	O
a	O
Message	O
Control	O
Program	O
(	O
MCP	O
)	O
and	O
zero	O
or	O
more	O
Message	O
Processing	O
Programs	O
(	O
MPP	O
)	O
.	O
</s>
<s>
This	O
is	O
similar	O
in	O
concept	O
to	O
the	O
much	O
later	O
internet	O
service	O
daemon	O
(	O
inetd	B-Protocol
)	O
in	O
unix	O
and	O
other	O
systems	O
.	O
</s>
<s>
The	O
MPPs	O
,	O
incorporating	O
logic	O
to	O
process	O
the	O
various	O
messages	O
,	O
are	O
supplied	O
by	O
the	O
installation	O
,	O
and	O
use	O
standard	O
OS/360	B-Application
or	O
DOS/360	B-Application
data	O
management	O
macros	O
OPEN	O
,	O
CLOSE	O
,	O
GET	O
,	O
and	O
PUT	O
.	O
</s>
<s>
PL/I	B-Language
includes	O
the	O
TRANSIENT	O
file	O
declaration	O
attribute	O
to	O
allow	O
MPPs	O
to	O
be	O
written	O
in	O
a	O
high-level	O
language	O
.	O
</s>
