<s>
The	O
LK421	B-Device
was	O
a	O
detachable	O
computer	O
keyboard	O
manufactured	O
by	O
Digital	O
Equipment	O
Corporation	O
of	O
Maynard	O
,	O
Massachusetts	O
and	O
supplied	O
as	O
an	O
option	O
to	O
the	O
standard	O
LK401	O
keyboard	O
with	O
their	O
DEC	B-Device
3000	I-Device
AXP	I-Device
workstations	O
.	O
</s>
<s>
The	O
keyboard	O
is	O
optimized	O
for	O
use	O
with	O
the	O
Digital	B-Operating_System
Unix	I-Operating_System
line	O
of	O
operating	O
systems	O
,	O
instead	O
of	O
the	O
OpenVMS	B-Operating_System
operating	O
system	O
for	O
which	O
the	O
LK401	O
was	O
more	O
suitable	O
.	O
</s>
<s>
The	O
keyboard	O
is	O
notable	O
for	O
the	O
standard	O
position	O
of	O
the	O
Control	B-Device
key	I-Device
for	O
use	O
with	O
Unix	B-Application
operating	I-Application
systems	I-Application
and	O
an	O
Escape	B-Device
key	I-Device
.	O
</s>
<s>
The	O
keyboard	O
has	O
two	O
compose	B-Device
keys	I-Device
.	O
</s>
