<s>
This	O
is	O
a	O
list	O
of	O
software	O
that	O
provides	O
an	O
alternative	O
graphical	B-Application
user	I-Application
interface	I-Application
for	O
Microsoft	B-Application
Windows	I-Application
operating	I-Application
systems	I-Application
.	O
</s>
<s>
The	O
technical	O
term	O
for	O
this	O
interface	O
is	O
a	O
shell	B-Operating_System
.	O
</s>
<s>
Windows	O
 '	O
standard	O
user	O
interface	O
is	O
the	O
Windows	B-Application
shell	I-Application
;	O
Windows	B-Application
3.0	I-Application
and	O
Windows	B-Application
3.1x	I-Application
have	O
a	O
different	O
shell	B-Operating_System
,	O
called	O
Program	O
Manager	O
.	O
</s>
<s>
The	O
programs	O
in	O
this	O
list	O
do	O
not	O
restyle	O
the	O
Windows	B-Application
shell	I-Application
,	O
but	O
replace	O
it	O
;	O
therefore	O
,	O
they	O
look	O
and	O
function	O
differently	O
,	O
and	O
have	O
different	O
configuration	O
options	O
.	O
</s>
