<s>
RasMol	B-Language
is	O
a	O
computer	O
program	O
written	O
for	O
molecular	O
graphics	O
visualization	O
intended	O
and	O
used	O
mainly	O
to	O
depict	O
and	O
explore	O
biological	O
macromolecule	O
structures	O
,	O
such	O
as	O
those	O
found	O
in	O
the	O
Protein	O
Data	O
Bank	O
.	O
</s>
<s>
Historically	O
,	O
it	O
was	O
an	O
important	O
tool	O
for	O
molecular	O
biologists	O
since	O
the	O
extremely	O
optimized	O
program	O
allowed	O
the	O
software	O
to	O
run	O
on	O
(	O
then	O
)	O
modestly	O
powerful	O
personal	B-Device
computers	I-Device
.	O
</s>
<s>
Before	O
RasMol	B-Language
,	O
visualization	O
software	O
ran	O
on	O
graphics	O
workstations	O
that	O
,	O
due	O
to	O
their	O
cost	O
,	O
were	O
less	O
accessible	O
to	O
scholars	O
.	O
</s>
<s>
RasMol	B-Language
continues	O
to	O
be	O
important	O
for	O
research	O
in	O
structural	O
biology	O
,	O
and	O
has	O
become	O
important	O
in	O
education	O
.	O
</s>
<s>
RasMol	B-Language
has	O
a	O
complex	O
licensing	B-License
version	O
history	O
.	O
</s>
<s>
Starting	O
with	O
the	O
version	O
2.7	O
series	O
,	O
RasMol	B-Language
source	O
code	O
is	O
dual-licensed	B-License
under	O
a	O
GNU	B-License
General	I-License
Public	I-License
License	I-License
(	O
GPL	B-License
)	O
,	O
or	O
custom	O
license	O
RASLIC	O
.	O
</s>
<s>
Starting	O
with	O
version	O
2.7.5	O
,	O
a	O
GPL	B-License
is	O
the	O
only	O
license	O
valid	O
for	O
binary	O
distributions	O
.	O
</s>
<s>
RasMol	B-Language
includes	O
a	O
scripting	B-Language
language	I-Language
,	O
to	O
perform	O
many	O
functions	O
such	O
as	O
selecting	O
certain	O
protein	O
chains	O
,	O
changing	O
colors	O
,	O
etc	O
.	O
</s>
<s>
Jmol	B-Language
and	O
Sirius	B-Application
software	O
have	O
incorporated	O
this	O
language	O
into	O
their	O
commands	O
.	O
</s>
<s>
Rasmol	B-Language
can	O
communicate	O
with	O
other	O
programs	O
via	O
Tcl/Tk	B-Application
on	O
Unix	B-Application
platforms	O
,	O
and	O
via	O
Dynamic	B-Operating_System
Data	I-Operating_System
Exchange	I-Operating_System
(	O
DDE	O
)	O
on	O
Microsoft	B-Application
Windows	I-Application
.	O
</s>
