<s>
User	B-Library
Interface	I-Library
Toolkit	I-Library
(	O
UIT	O
)	O
is	O
a	O
discontinued	O
object-oriented	B-Language
layer	O
that	O
was	O
implemented	O
in	O
C++	B-Language
programming	I-Language
language	I-Language
atop	O
the	O
XView	B-Library
graphical	O
toolkit	B-Library
.	O
</s>
<s>
In	O
1991	O
,	O
Soloway	O
received	O
permission	O
from	O
Sun	O
to	O
contribute	O
the	O
UIT	O
to	O
the	O
Massachusetts	O
Institute	O
of	O
Technology	O
(	O
MIT	O
)	O
X	B-Operating_System
Window	I-Operating_System
System	I-Operating_System
(	O
X11	B-Operating_System
)	O
distribution	O
.	O
</s>
