<s>
Portable	B-Application
application	I-Application
creators	I-Application
allow	O
the	O
creation	O
of	O
portable	B-Application
applications	I-Application
(	O
also	O
called	O
portable	B-Application
apps	I-Application
)	O
.	O
</s>
<s>
They	O
usually	O
use	O
application	B-Operating_System
virtualization	I-Operating_System
.	O
</s>
<s>
No	O
agent	B-General_Concept
or	O
client	B-Protocol
is	O
required	O
for	O
these	O
(	O
also	O
called	O
"	O
agentless	B-General_Concept
"	O
solutions	O
)	O
:	O
</s>
