<s>
The	O
Unix	O
Desktop	O
Environment	O
(	O
UDE	B-Application
)	O
is	O
a	O
desktop	O
environment	O
for	O
the	O
X	B-Operating_System
Window	I-Operating_System
System	I-Operating_System
.	O
</s>
<s>
Given	O
its	O
efficient	O
and	O
lightweight	O
design	O
it	O
can	O
be	O
used	O
on	O
almost	O
any	O
Unix-like	B-Operating_System
operating	I-Operating_System
system	I-Operating_System
,	O
mostly	O
without	O
any	O
porting	O
effort	O
.	O
</s>
<s>
UDE	B-Application
's	O
user	B-Application
interface	I-Application
philosophy	O
is	O
quite	O
different	O
from	O
that	O
of	O
other	O
desktop	O
environments	O
.	O
</s>
<s>
Combinations	O
of	O
mouse	O
clicks	O
can	O
trigger	O
more	O
complex	O
actions	O
such	O
as	O
moving	O
a	O
window	O
from	O
one	O
workspace	B-Application
to	O
another	O
or	O
loading	O
multiple	O
programs	B-Application
(	O
or	O
multiple	O
instances	O
of	O
a	O
single	O
program	O
)	O
at	O
a	O
time	O
.	O
</s>
<s>
For	O
that	O
reason	O
,	O
efficient	O
usage	O
of	O
UDE	B-Application
is	O
only	O
possible	O
using	O
a	O
three-button	O
mouse	O
.	O
</s>
<s>
As	O
of	O
today	O
,	O
UDE	B-Application
offers	O
only	O
very	O
basic	O
support	O
for	O
keyboard	O
shortcuts	O
.	O
</s>
<s>
The	O
window	O
manager	O
is	O
uwm	B-Device
(	O
unrelated	O
to	O
the	O
older	O
uwm	B-Device
from	O
1985	O
or	O
previous	O
)	O
.	O
</s>
