<s>
In	O
human	O
–	O
computer	O
interaction	O
,	O
a	O
command	B-Application
verb	I-Application
is	O
a	O
verb	O
that	O
appears	O
in	O
a	O
user	B-Application
interface	I-Application
and	O
is	O
used	O
for	O
the	O
user	O
to	O
tell	O
the	O
computer	O
to	O
do	O
something	O
(	O
rather	O
than	O
vice	O
versa	O
)	O
.	O
</s>
<s>
For	O
instance	O
,	O
the	O
words	O
"	O
edit	O
"	O
and	O
"	O
view	O
"	O
and	O
"	O
help	O
"	O
that	O
appear	O
in	O
the	O
Web	B-Application
browser	I-Application
menu	O
are	O
all	O
clearly	O
verbs	O
.	O
</s>
<s>
A	O
reflexive	O
user	B-Application
interface	I-Application
is	O
one	O
in	O
which	O
commands	O
and	O
perhaps	O
other	O
controls	O
are	O
defined	O
in	O
the	O
interface	O
itself	O
.	O
</s>
