<s>
In	O
computing	O
,	O
a	O
login	B-Operating_System
session	I-Operating_System
is	O
the	O
period	O
of	O
activity	O
between	O
a	O
user	O
logging	B-General_Concept
in	I-General_Concept
and	O
logging	B-General_Concept
out	I-General_Concept
of	O
a	O
(	O
multi-user	O
)	O
system	O
.	O
</s>
<s>
On	O
Unix	B-Application
and	O
Unix-like	B-Operating_System
operating	I-Operating_System
systems	I-Operating_System
,	O
a	O
login	B-Operating_System
session	I-Operating_System
takes	O
one	O
of	O
two	O
main	O
forms	O
:	O
</s>
<s>
On	O
Windows	O
NT-based	O
systems	O
,	O
login	B-Operating_System
sessions	I-Operating_System
are	O
maintained	O
by	O
the	O
kernel	B-Operating_System
and	O
control	O
of	O
them	O
is	O
within	O
the	O
purview	O
of	O
the	O
Local	O
Security	O
Authority	O
Subsystem	O
Service	O
(	O
LSA	O
)	O
.	O
</s>
<s>
winlogon	O
responds	O
to	O
the	O
secure	O
attention	O
key	O
,	O
it	O
requests	O
the	O
LSA	O
to	O
create	O
login	B-Operating_System
sessions	I-Operating_System
on	O
login	B-General_Concept
,	O
and	O
terminates	O
all	O
of	O
the	O
processes	O
belonging	O
to	O
a	O
login	B-Operating_System
session	I-Operating_System
on	O
logout	O
.	O
</s>
