<s>
SAP	B-Application
NetWeaver	I-Application
Process	I-Application
Integration	I-Application
(	O
SAP	B-Application
PI	I-Application
)	O
is	O
SAP	B-Application
's	O
enterprise	B-Architecture
application	I-Architecture
integration	I-Architecture
(	O
EAI	O
)	O
software	O
,	O
a	O
component	O
of	O
the	O
NetWeaver	B-Application
product	O
group	O
used	O
to	O
facilitate	O
the	O
exchange	O
of	O
information	O
among	O
a	O
company	O
's	O
internal	O
software	O
and	O
systems	O
and	O
those	O
of	O
external	O
parties	O
.	O
</s>
<s>
Before	O
the	O
current	O
version	O
,	O
SAP	B-Application
PI	I-Application
was	O
called	O
SAP	B-Application
Exchange	I-Application
Infrastructure	I-Application
(	O
SAP	B-Application
XI	I-Application
)	O
.	O
</s>
<s>
Like	O
other	O
NetWeaver	B-Application
components	O
,	O
SAP	B-Application
PI	I-Application
is	O
compatible	O
with	O
software	O
products	O
of	O
other	O
companies	O
.	O
</s>
<s>
SAP	B-Application
calls	O
PI	O
an	O
integration	B-General_Concept
broker	I-General_Concept
because	O
it	O
mediates	O
between	O
entities	O
with	O
varying	O
requirements	O
in	O
terms	O
of	O
connectivity	O
,	O
format	O
,	O
and	O
protocols	O
.	O
</s>
<s>
According	O
to	O
SAP	B-Application
,	O
PI	O
reduces	O
the	O
TCO	O
by	O
providing	O
a	O
common	O
repository	O
for	O
interfaces	O
.	O
</s>
<s>
The	O
central	O
component	O
of	O
SAP	B-Application
PI	I-Application
is	O
the	O
SAP	B-Application
Integration	O
Server	O
,	O
which	O
facilitates	O
interaction	O
between	O
diverse	O
operating	O
systems	O
and	O
applications	O
across	O
internal	O
and	O
external	O
networked	O
computer	O
systems	O
.	O
</s>
<s>
PI	O
is	O
built	O
upon	O
the	O
SAP	B-Language
Web	I-Language
Application	I-Language
Server	I-Language
.	O
</s>
<s>
First	O
release	O
of	O
SAP	B-Application
Exchange	I-Application
Infrastructure	I-Application
was	O
XI	O
2.0	O
.	O
</s>
<s>
From	O
release	O
7.0	O
onwards	O
,	O
SAP	B-Application
Exchange	I-Application
Infrastructure	I-Application
has	O
been	O
renamed	O
as	O
SAP	B-Application
Process	I-Application
Integration	I-Application
(	O
SAP	B-Application
PI	I-Application
)	O
.	O
</s>
<s>
SAP	B-Application
NetWeaver	I-Application
PI	O
allows	O
for	O
Single	O
Sign-On	O
through	O
SAP	B-Application
Logon	O
Tickets	O
and	O
x.509	O
certificates	O
.	O
</s>
<s>
Certificates	O
allow	O
for	O
the	O
usage	O
of	O
Secure	B-Application
Network	I-Application
Communications	I-Application
(	O
SNC	O
)	O
and	O
Secure	B-Protocol
Sockets	I-Protocol
Layer	I-Protocol
(	O
SSL	O
)	O
.	O
</s>
