<s>
A	O
grant	B-Protocol
table	I-Protocol
is	O
an	O
interface	O
which	O
grants	O
access	O
to	O
memory	B-General_Concept
pages	I-General_Concept
to	O
Virtual	B-Architecture
Machines	I-Architecture
that	O
do	O
not	O
own	O
the	O
pages	O
.	O
</s>
<s>
Grant	B-Protocol
tables	I-Protocol
are	O
implemented	O
on	O
Xen	B-Operating_System
hypervisor	I-Operating_System
.	O
</s>
<s>
Grant	B-Protocol
tables	I-Protocol
are	O
generally	O
used	O
in	O
inter-virtual	O
machine	O
communication	O
,	O
when	O
one	O
of	O
the	O
communicating	O
VM	O
's	O
requires	O
pages	O
owned	O
by	O
the	O
other	O
VM	O
.	O
</s>
