<s>
Direct	B-Operating_System
Machine	I-Operating_System
Environment	I-Operating_System
,	O
abbreviated	O
DME	O
,	O
was	O
a	O
mainframe	B-Architecture
environment	O
for	O
the	O
ICL	B-Device
2900	I-Device
Series	I-Device
of	O
computing	O
systems	O
from	O
International	O
Computers	O
Limited	O
that	O
was	O
developed	O
in	O
the	O
1970s	O
.	O
</s>
<s>
DME	O
was	O
more-or-less	O
an	O
ICL	B-Device
1900	I-Device
order	O
code	O
processor	O
in	O
microcode	B-Device
,	O
which	O
permitted	O
the	O
ICL	B-Device
1900	I-Device
series	I-Device
executive	O
,	O
operating	B-General_Concept
systems	I-General_Concept
and	O
program	B-Library
libraries	I-Library
to	O
operate	O
on	O
the	O
ICL	B-Device
2900	I-Device
series	I-Device
.	O
</s>
<s>
DME	O
was	O
developed	O
so	O
that	O
customers	O
could	O
buy	O
the	O
new	O
hardware	O
and	O
run	O
their	O
1900	O
or	O
System	B-Device
4	I-Device
applications	O
whilst	O
they	O
developed	O
their	O
replacement	O
VME	B-General_Concept
applications	O
.	O
</s>
<s>
This	O
led	O
to	O
some	O
users	O
running	O
DME	O
and	O
VME	B-General_Concept
alternately	O
on	O
the	O
same	O
machine	O
for	O
some	O
years	O
.	O
</s>
<s>
This	O
,	O
and	O
the	O
fact	O
that	O
some	O
users	O
were	O
not	O
moving	O
to	O
the	O
new	O
system	O
,	O
led	O
ICL	O
to	O
develop	O
a	O
system	O
called	O
Concurrent	O
Machine	O
Environment	O
(	O
CME	O
)	O
under	O
which	O
VME	B-General_Concept
ran	O
DME	O
as	O
a	O
subsystem	O
,	O
enabling	O
1900	O
and	O
System	B-Device
4	I-Device
applications	O
to	O
be	O
run	O
on	O
a	O
2900	O
or	O
Series	B-Device
39	I-Device
machine	O
alongside	O
VME	B-General_Concept
applications	O
.	O
</s>
