<s>
A	O
login	B-Device
manager	I-Device
is	O
a	O
login	B-General_Concept
system	O
for	O
Unix	B-Application
and	O
Unix-like	B-Operating_System
operating	I-Operating_System
systems	I-Operating_System
.	O
</s>
<s>
It	O
comprises	O
a	O
login	B-General_Concept
daemon	B-Operating_System
,	O
a	O
login	B-General_Concept
user	B-Application
interface	I-Application
,	O
and	O
a	O
system	O
for	O
tracking	O
login	B-Operating_System
sessions	I-Operating_System
.	O
</s>
<s>
When	O
a	O
user	O
tries	O
to	O
log	O
in	O
,	O
the	O
login	B-Device
manager	I-Device
passes	O
the	O
user	O
's	O
credentials	O
to	O
an	O
authentication	O
system	O
.	O
</s>
<s>
Since	O
an	O
X	B-Device
display	I-Device
manager	I-Device
is	O
a	O
graphical	B-Application
user	I-Application
interface	I-Application
for	O
login	B-General_Concept
,	O
some	O
people	O
use	O
the	O
terms	O
display	B-Device
manager	I-Device
and	O
login	B-Device
manager	I-Device
synonymously	O
.	O
</s>
<s>
systemd	B-Application
,	O
an	O
init	B-Operating_System
daemon	B-Operating_System
for	O
Linux	B-Application
,	O
has	O
an	O
integrated	O
login	B-Device
manager	I-Device
;	O
its	O
login	B-General_Concept
daemon	B-Operating_System
is	O
called	O
logind	O
.	O
</s>
<s>
systemd	B-Application
's	O
login	B-Device
manager	I-Device
is	O
an	O
alternative	O
to	O
ConsoleKit	O
.	O
</s>
