<s>
BeOS	B-Device
R5.1d0	I-Device
or	O
Dano/EXP	O
(	O
also	O
known	O
as	O
EXP	O
,	O
Dano	B-Device
,	O
and	O
incorrectly	O
as	O
Dan0/EXP	O
or	O
Dan0	O
)	O
is	O
the	O
build	O
codename	O
and	O
most	O
commonly	O
used	O
name	O
to	O
refer	O
to	O
a	O
leaked	O
R5.1	O
prerelease	O
of	O
the	O
Be	B-Application
Operating	I-Application
System	I-Application
.	O
</s>
<s>
Dano	B-Device
's	O
build	O
date	O
is	O
15	O
November	O
2001	O
,	O
the	O
day	O
of	O
Be	O
Inc.	O
'	O
s	O
closure	O
.	O
</s>
<s>
Dano	B-Device
features	O
an	O
improved	O
network	B-Protocol
stack	I-Protocol
called	O
BONE	O
,	O
initial	O
support	O
for	O
802.11b	O
wireless	B-General_Concept
networking	I-General_Concept
,	O
some	O
3D	O
acceleration-capable	O
graphics	O
drivers	B-Application
,	O
a	O
redesigned	O
graphical	B-Application
user	I-Application
interface	I-Application
,	O
a	O
replacement	O
USB	B-Protocol
subsystem	O
with	O
USB	B-Architecture
mass	I-Architecture
storage	I-Architecture
support	O
,	O
and	O
other	O
improvements	O
.	O
</s>
<s>
Many	O
of	O
these	O
features	O
had	O
been	O
promised	O
for	O
BeOS	B-Device
R5	I-Device
a	O
year	O
earlier	O
and	O
not	O
delivered	O
.	O
</s>
<s>
In	O
a	O
potential	O
move	O
towards	O
releasing	O
the	O
system	O
as	O
open	B-Application
source	I-Application
software	I-Application
,	O
many	O
proprietary	B-Application
items	O
had	O
been	O
removed	O
:	O
the	O
MP3	B-Application
encoder	I-Application
was	O
replaced	O
with	O
LAME	B-Algorithm
,	O
and	O
OpenSSL	B-Language
replaced	O
the	O
RSA	O
Encryption	O
Engine	O
in	O
the	O
NetPositive	B-Application
web	B-Application
browser	I-Application
.	O
</s>
<s>
The	O
ZETA	B-Device
operating	O
system	O
was	O
initially	O
based	O
on	O
the	O
Dano	B-Device
codebase	O
,	O
though	O
it	O
has	O
since	O
evolved	O
.	O
</s>
