<s>
Active	B-Language
Oberon	I-Language
is	O
a	O
general	O
purpose	O
programming	O
language	O
developed	O
during	O
1996-1998	O
by	O
the	O
group	O
around	O
Niklaus	O
Wirth	O
and	O
Jürg	O
Gutknecht	O
at	O
the	O
Swiss	O
Federal	O
Institute	O
of	O
Technology	O
in	O
Zürich	O
(	O
ETH	O
Zurich	O
)	O
.	O
</s>
<s>
It	O
is	O
an	O
extension	O
of	O
the	O
programming	O
language	O
Oberon	B-Language
.	O
</s>
<s>
Compared	O
to	O
its	O
predecessors	O
,	O
Oberon	B-Language
and	O
Oberon-2	B-Language
,	O
Active	B-Language
Oberon	I-Language
adds	O
objects	O
(	O
with	O
object-centered	O
access	O
protection	O
and	O
local	O
activity	O
control	O
)	O
,	O
system-guarded	O
assertions	O
,	O
preemptive	O
priority	O
scheduling	O
and	O
a	O
changed	O
syntax	O
for	O
methods	B-Language
(	O
named	O
type-bound	O
procedures	O
in	O
Oberon	B-Language
vocabulary	O
)	O
.	O
</s>
<s>
Objects	O
may	O
be	O
active	O
,	O
which	O
means	O
that	O
they	O
may	O
be	O
threads	B-Operating_System
or	O
processes	B-Operating_System
.	O
</s>
<s>
The	O
operating	O
system	O
named	O
Active	O
Object	B-Language
System	I-Language
(	O
AOS	O
)	O
in	O
2002	O
,	O
then	O
due	O
to	O
trademark	O
issues	O
,	O
renamed	O
Bluebottle	O
in	O
2005	O
,	O
and	O
then	O
renamed	O
A2	B-Application
in	O
2008	O
,	O
especially	O
the	O
kernel	O
,	O
synchronizes	O
and	O
coordinates	O
different	O
active	O
objects	O
.	O
</s>
<s>
Unlike	O
Java	B-Language
or	O
C#	B-Application
,	O
objects	O
may	O
be	O
synchronized	O
not	O
only	O
with	O
signals	B-Operating_System
but	O
directly	O
on	O
conditions	O
.	O
</s>
<s>
This	O
simplifies	O
concurrent	B-Architecture
programs	I-Architecture
and	O
their	O
development	O
.	O
</s>
<s>
An	O
Active	B-Language
Oberon	I-Language
fork	B-Application
is	O
the	O
language	O
Zonnon	B-Language
.	O
</s>
