<s>
Epsilon	B-Operating_System
is	O
a	O
programmer	B-Application
's	O
text	B-Application
editor	I-Application
modelled	O
after	O
Emacs	B-Application
.	O
</s>
<s>
It	O
resembles	O
Emacs	B-Application
not	O
only	O
in	O
its	O
default	O
keybindings	O
and	O
layout	O
,	O
but	O
also	O
in	O
the	O
fact	O
that	O
it	O
has	O
a	O
Turing-complete	B-Algorithm
extension	B-Language
language	I-Language
in	O
which	O
much	O
of	O
its	O
functionality	O
is	O
implemented	O
.	O
</s>
<s>
Unlike	O
Emacs	B-Application
,	O
Epsilon	B-Operating_System
's	O
extension	B-Language
language	I-Language
,	O
EEL	O
(	O
Epsilon	B-Operating_System
Extension	B-Language
Language	I-Language
)	O
is	O
a	O
dialect	O
of	O
C	B-Language
rather	O
than	O
a	O
dialect	O
of	O
Lisp	B-Language
.	O
</s>
<s>
Epsilon	B-Operating_System
runs	O
on	O
DOS	B-Device
,	O
Microsoft	B-Application
Windows	I-Application
,	O
Linux	B-Application
,	O
FreeBSD	B-Operating_System
,	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
and	O
OS/2	B-Application
.	O
</s>
<s>
Epsilon	B-Operating_System
is	O
a	O
commercial	O
product	O
sold	O
by	O
Lugaru	O
Software	O
.	O
</s>
<s>
It	O
was	O
first	O
released	O
in	O
1984	O
,	O
long	O
before	O
Emacs	B-Application
was	O
available	O
on	O
personal	O
computers	O
,	O
and	O
it	O
provided	O
an	O
attractive	O
alternative	O
to	O
the	O
usual	O
DOS	B-Device
editors	O
for	O
those	O
accustomed	O
to	O
Emacs	B-Application
.	O
</s>
<s>
It	O
was	O
also	O
the	O
first	O
DOS	B-Device
based	O
editor	O
to	O
allow	O
editing	O
of	O
files	O
that	O
were	O
larger	O
than	O
available	O
RAM	O
,	O
and	O
one	O
of	O
the	O
first	O
to	O
allow	O
running	O
programs	O
(	O
such	O
as	O
compilers	O
)	O
in	O
the	O
background	O
while	O
allowing	O
editing	O
to	O
proceed	O
concurrently	O
on	O
DOS	B-Device
.	O
</s>
<s>
Epsilon	B-Operating_System
supports	O
Unicode	O
but	O
does	O
not	O
display	O
characters	O
outside	O
the	O
BMP	O
and	O
cannot	O
presently	O
handle	O
right-to-left	O
scripts	O
.	O
</s>
<s>
BYTE	B-Application
in	O
1989	O
listed	O
Epsilon	B-Operating_System
as	O
among	O
the	O
"	O
Distinction	O
"	O
winners	O
of	O
the	O
BYTE	B-Application
Awards	O
,	O
especially	O
praising	O
EEL	O
.	O
</s>
