<s>
Yet	B-General_Concept
Another	I-General_Concept
Previewer	I-General_Concept
(	O
or	O
YAP	O
)	O
is	O
the	O
name	O
of	O
two	O
different	O
document	O
previewing	O
applications	O
,	O
one	O
for	O
DVI	B-Application
and	O
one	O
for	O
PostScript	B-Language
.	O
</s>
<s>
The	O
YAP	O
for	O
PostScript	B-Language
previewing	O
is	O
used	O
to	O
dynamically	O
edit	O
and	O
re-render	O
PostScript	B-Language
as	O
if	O
one	O
was	O
editing	O
a	O
file	O
,	O
unlike	O
the	O
actual	O
PostScript	B-Language
interpreter	O
itself	O
(	O
such	O
as	O
ghostscript	B-Language
)	O
,	O
which	O
deals	O
with	O
PostScript	B-Language
input	O
interactively	O
from	O
a	O
user	O
.	O
</s>
<s>
YAP	O
first	O
was	O
bundled	O
with	O
the	O
NeXT	O
demos	O
package	O
of	O
NeXTSTEP	B-Application
,	O
which	O
was	O
also	O
bundled	O
with	O
OPENSTEP	B-Operating_System
.	O
</s>
<s>
It	O
was	O
not	O
carried	O
into	O
its	O
incarnation	O
as	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
,	O
presumably	O
because	O
of	O
PostScript	B-Language
's	O
lessened	O
importance	O
with	O
the	O
OS	B-Operating_System
X	I-Operating_System
subsystems	O
relying	O
on	O
Display	B-Application
PDF	I-Application
instead	O
.	O
</s>
<s>
The	O
YAP	O
for	O
DVI	B-Application
viewing	O
is	O
a	O
program	O
bundled	O
with	O
the	O
widely	O
used	O
MiKTeX	B-General_Concept
TeX	B-Application
distribution	O
for	O
the	O
Microsoft	B-Application
Windows	I-Application
platform	O
.	O
</s>
<s>
It	O
supports	O
PostScript	B-Language
specials	O
(	O
for	O
instance	O
,	O
rendering	O
LaTeX	B-Application
documents	O
with	O
PSTricks	B-Language
)	O
.	O
</s>
<s>
Since	O
YAP	O
supports	O
inverse	O
search	O
(	O
when	O
the	O
DVI	B-Application
file	O
was	O
compiled	O
with	O
source	O
specials	O
)	O
,	O
it	O
can	O
be	O
configured	O
to	O
launch	O
a	O
LaTeX	B-Application
editor	O
for	O
the	O
source	O
file	O
,	O
placing	O
the	O
cursor	O
on	O
the	O
corresponding	O
word	O
under	O
the	O
cursor	O
in	O
YAP	O
.	O
</s>
<s>
However	O
,	O
unlike	O
PDF	B-Application
,	O
there	O
is	O
no	O
search	O
facility	O
.	O
</s>
<s>
YAP	O
is	O
free	B-Application
software	I-Application
published	O
under	O
the	O
GNU	B-License
GPL	I-License
.	O
</s>
