<s>
Lightweight	B-Application
Third-Party	I-Application
Authentication	I-Application
(	O
LTPA	B-Application
)	O
,	O
is	O
an	O
authentication	O
technology	O
used	O
in	O
IBM	B-Language
WebSphere	I-Language
and	O
Lotus	B-Operating_System
Domino	I-Operating_System
products	O
.	O
</s>
<s>
When	O
accessing	O
web	B-Application
servers	I-Application
that	O
use	O
the	O
LTPA	B-Application
technology	O
it	O
is	O
possible	O
for	O
a	O
web	O
user	O
to	O
re-use	O
their	O
login	B-General_Concept
across	O
physical	O
servers	O
.	O
</s>
<s>
A	O
Lotus	B-Operating_System
Domino	I-Operating_System
server	O
or	O
an	O
IBM	B-Language
WebSphere	I-Language
server	O
that	O
is	O
configured	O
to	O
use	O
the	O
LTPA	B-Application
authentication	O
will	O
challenge	O
the	O
web	O
user	O
for	O
a	O
name	O
and	O
password	O
.	O
</s>
<s>
When	O
the	O
user	O
has	O
been	O
authenticated	O
,	O
their	O
browser	B-Application
will	O
have	O
received	O
a	O
session	O
cookie	O
-	O
a	O
cookie	O
that	O
is	O
only	O
available	O
for	O
one	O
browsing	O
session	O
.	O
</s>
<s>
This	O
cookie	O
contains	O
the	O
LTPA	B-Application
token	O
.	O
</s>
<s>
If	O
the	O
user	O
after	O
having	O
received	O
the	O
LTPA	B-Application
token	O
accesses	O
a	O
server	O
that	O
is	O
a	O
member	O
of	O
the	O
same	O
authentication	O
realm	O
as	O
the	O
first	O
server	O
,	O
and	O
if	O
the	O
browsing	O
session	O
has	O
not	O
been	O
terminated	O
(	O
the	O
browser	B-Application
was	O
not	O
closed	O
down	O
)	O
,	O
then	O
the	O
user	O
is	O
automatically	O
authenticated	O
and	O
will	O
not	O
be	O
challenged	O
for	O
a	O
name	O
and	O
password	O
.	O
</s>
