<s>
Object	B-General_Concept
–	I-General_Concept
action	I-General_Concept
interface	I-General_Concept
,	O
also	O
abbreviated	O
as	O
OAI	O
,	O
is	O
an	O
extension	O
to	O
the	O
graphical	B-Application
user	I-Application
interface	I-Application
,	O
especially	O
related	O
to	O
direct	O
manipulation	O
user	O
interface	O
and	O
it	O
can	O
help	O
to	O
create	O
better	O
human	O
–	O
computer	O
interfaces	O
and	O
increase	O
the	O
usability	O
of	O
a	O
product	O
.	O
</s>
<s>
Moreover	O
,	O
it	O
emulates	O
WYSIWYG	B-Application
.	O
</s>
