<s>
XVT	B-Library
is	O
a	O
software	O
development	O
environment	O
for	O
building	O
cross-platform	B-Operating_System
GUI	B-Application
applications	O
in	O
C	B-Language
or	O
C++	B-Language
.	O
</s>
<s>
XVT	B-Library
allows	O
developers	O
to	O
graphically	O
lay	O
out	O
an	O
application	O
's	O
GUI	B-Application
,	O
and	O
provides	O
cross-platform	B-Operating_System
libraries	O
to	O
aid	O
development	O
.	O
</s>
<s>
XVT	B-Library
has	O
been	O
in	O
development	O
since	O
1989	O
and	O
has	O
provided	O
a	O
cross-platform	B-Operating_System
software	I-Operating_System
development	O
toolkit	O
for	O
the	O
majority	O
of	O
that	O
time	O
.	O
</s>
<s>
XVT	B-Library
is	O
an	O
"	O
abstraction	O
layer	O
"	O
that	O
removes	O
the	O
developer	O
from	O
being	O
concerned	O
with	O
which	O
OS	O
the	O
application	O
will	O
run	O
on	O
.	O
</s>
<s>
When	O
the	O
application	O
is	O
compiled	O
,	O
the	O
XVT	B-Library
API	O
points	O
to	O
the	O
native	O
controls/widgets	O
for	O
the	O
OS	O
on	O
which	O
the	O
code	O
is	O
being	O
compiled	O
.	O
</s>
<s>
There	O
are	O
other	O
uses	O
of	O
this	O
product	O
beyond	O
cross	B-Operating_System
platform	I-Operating_System
development	O
.	O
</s>
<s>
As	O
a	O
CASE	B-Application
tool	I-Application
,	O
a	O
non-programmer	O
business	O
analyst	O
can	O
lay	O
out	O
the	O
user	O
interfaces	O
,	O
review	O
them	O
with	O
end	O
users	O
and	O
subject	O
matter	O
experts	O
in	O
a	O
RAD-like	O
(	O
Rapid	O
Application	O
Development	O
)	O
requirements	O
capture	O
by	O
functional	O
review	O
,	O
and	O
then	O
the	O
XVT	B-Library
architect	O
tool	O
will	O
deliver	O
the	O
C	B-Language
or	O
C++	B-Language
(	O
ANSI-compliant	O
)	O
code	O
.	O
</s>
<s>
The	O
developers	O
have	O
announced	O
support	O
for	O
GTK+	O
on	O
Linux	B-Application
and	O
Cocoa	O
on	O
Mac	O
,	O
but	O
these	O
ports	O
are	O
not	O
yet	O
available	O
.	O
</s>
<s>
Because	O
Microsoft	O
no	O
longer	O
support	O
the	O
HLP	O
help	O
format	O
,	O
XVT	B-Library
applications	O
require	O
the	O
user	O
to	O
install	O
the	O
.	O
</s>
<s>
XVT	B-Library
was	O
originally	O
developed	O
by	O
Advanced	O
Programming	O
Institute	O
in	O
Boulder	O
Co.	O
,	O
a	O
company	O
founded	O
by	O
former	O
Bell	O
Labs	O
employee	O
Marc	O
Rochkind	O
.	O
</s>
<s>
The	O
company	O
changed	O
its	O
name	O
to	O
XVT	B-Library
when	O
that	O
product	O
became	O
the	O
main	O
company	O
effort	O
.	O
</s>
<s>
The	O
XVT	B-Library
product	O
was	O
purchased	O
by	O
Providence	O
Software	O
Solutions	O
in	O
2001	O
.	O
</s>
<s>
XVT	B-Library
currently	O
supports	O
:	O
</s>
<s>
XVT	B-Library
DSC	O
includes	O
the	O
PTK	O
,	O
or	O
Portability	O
ToolKit	O
,	O
and	O
the	O
XVT	B-Library
Design	O
interface	O
designer	O
.	O
</s>
<s>
It	O
is	O
designed	O
for	O
use	O
with	O
C	B-Language
.	O
</s>
<s>
XVT	B-Library
DSP	O
includes	O
the	O
PTK	O
,	O
Power++	O
library	O
(	O
C++	B-Language
bindings	O
to	O
the	O
PTK	O
)	O
,	O
and	O
the	O
XVT	B-Library
Architect	O
interface	O
designer	O
.	O
</s>
<s>
It	O
is	O
designed	O
for	O
use	O
with	O
C++	B-Language
.	O
</s>
<s>
XVT	B-Library
Net	O
allows	O
applications	O
built	O
using	O
either	O
of	O
the	O
other	O
editions	O
to	O
be	O
recompiled	O
as	O
a	O
networked	O
application	O
.	O
</s>
