<s>
DoubleDOS	B-Device
was	O
a	O
computer	B-Application
program	I-Application
that	O
extended	O
the	O
IBM	B-Operating_System
PC	I-Operating_System
DOS	I-Operating_System
operating	O
system	O
with	O
limited	O
multitasking	B-Operating_System
capabilities	O
.	O
</s>
<s>
DoubleDOS	B-Device
was	O
announced	O
in	O
1984	O
by	O
a	O
firm	O
called	O
Softlogic	O
Solutions	O
,	O
and	O
sold	O
for	O
USD299	O
.	O
</s>
<s>
In	O
a	O
1987	O
ad	O
,	O
the	O
company	O
offered	O
the	O
software	O
for	O
USD49.99	O
,	O
pitting	O
it	O
against	O
competitors	O
TopView	B-Operating_System
and	O
Windows	B-Application
.	O
</s>
<s>
A	O
review	O
in	O
1986	O
's	O
Business	O
Software	O
found	O
programs	O
running	O
under	O
DoubleDOS	B-Device
ran	O
considerably	O
slower	O
,	O
"	O
even	O
when	O
nothing	O
is	O
running	O
in	O
the	O
other	O
partition	O
"	O
.	O
</s>
