<s>
htop	B-Device
is	O
an	O
interactive	O
system-monitor	B-Application
process-viewer	O
and	O
process-manager	O
.	O
</s>
<s>
It	O
is	O
designed	O
as	O
an	O
alternative	O
to	O
the	O
Unix	O
program	O
top	B-Device
.	O
</s>
<s>
Unlike	O
top	B-Device
,	O
htop	B-Device
provides	O
a	O
full	O
list	O
of	O
processes	O
running	O
,	O
instead	O
of	O
the	O
top	B-Device
resource-consuming	O
processes	O
.	O
</s>
<s>
htop	B-Device
uses	O
color	O
and	O
gives	O
visual	O
information	O
about	O
processor	B-General_Concept
,	O
swap	O
and	O
memory	B-Architecture
status	O
.	O
</s>
<s>
htop	B-Device
can	O
also	O
display	O
the	O
processes	O
as	O
a	O
tree	O
.	O
</s>
<s>
Users	O
often	O
deploy	O
htop	B-Device
in	O
cases	O
where	O
Unix	B-Device
top	I-Device
does	O
not	O
provide	O
enough	O
information	O
about	O
the	O
system	O
's	O
processes	O
.	O
</s>
<s>
htop	B-Device
is	O
also	O
popularly	O
used	O
interactively	O
as	O
a	O
system	B-Application
monitor	I-Application
.	O
</s>
<s>
Compared	O
to	O
top	B-Device
,	O
it	O
provides	O
a	O
more	O
convenient	O
,	O
visual	O
,	O
cursor-controlled	O
interface	O
for	O
sending	O
signals	B-General_Concept
to	O
processes	O
.	O
</s>
<s>
htop	B-Device
is	O
written	O
in	O
the	O
C	B-Language
programming	I-Language
language	I-Language
using	O
the	O
ncurses	B-Language
library	O
.	O
</s>
<s>
Its	O
name	O
is	O
derived	O
from	O
the	O
original	O
author	O
's	O
first	O
name	O
,	O
as	O
a	O
nod	O
to	O
pinfo	O
,	O
an	O
info-replacement	O
program	O
that	O
does	O
the	O
same	O
.	O
</s>
<s>
Because	O
system	B-Application
monitoring	I-Application
interfaces	O
are	O
not	O
standardized	O
among	O
Unix-like	B-Operating_System
operating	I-Operating_System
systems	I-Operating_System
,	O
much	O
of	O
htop	B-Device
's	O
code	O
must	O
be	O
rewritten	O
for	O
each	O
operating	O
system	O
.	O
</s>
<s>
Cross-platform	O
,	O
OpenBSD	B-Operating_System
,	O
FreeBSD	B-Operating_System
and	O
Mac	B-Application
OS	I-Application
X	O
,	O
support	O
was	O
added	O
in	O
htop	B-Device
2.0	O
.	O
</s>
<s>
Solaris/Illumos/OpenIndiana	O
support	O
added	O
in	O
2.2.0	O
.	O
</s>
<s>
htop	B-Device
was	O
forked	O
by	O
several	O
developers	O
as	O
htop-dev	O
,	O
and	O
with	O
support	O
from	O
the	O
original	O
author	O
,	O
the	O
homepage	O
was	O
later	O
redirected	O
to	O
a	O
new	O
domain	O
.	O
</s>
