<s>
FBB	B-Architecture
is	O
a	O
free	O
and	O
open	O
source	O
bulletin	B-Application
board	I-Application
system	I-Application
for	O
packet	O
transmissions	O
of	O
radio	O
amateurs	O
.	O
</s>
<s>
Written	O
in	O
C	B-Language
programming	I-Language
language	I-Language
,	O
it	O
allows	O
transmission	O
of	O
messages	O
over	O
the	O
AX.25	B-Protocol
packet	B-Application
radio	I-Application
network	O
by	O
VHF	O
,	O
PACTOR	B-Device
on	O
HF	O
and	O
Internet	O
.	O
</s>
<s>
Originally	O
an	O
MS-DOS	B-Application
program	O
,	O
the	O
current	O
versions	O
run	O
on	O
Linux	B-Application
and	O
32-bit	B-Application
Windows	I-Application
.	O
</s>
<s>
Created	O
in	O
1986	O
and	O
consistently	O
maintained	O
,	O
it	O
can	O
be	O
compared	O
to	O
DPBOX	O
and	O
Winlink	B-Protocol
system	O
,	O
with	O
which	O
it	O
is	O
compatible	O
(	O
Routing	O
mail	O
by	O
the	O
Open	O
FBB	B-Architecture
forwarding	O
protocol	O
)	O
.	O
</s>
