<s>
GNU	B-Application
GLOBAL	I-Application
is	O
a	O
software	B-Application
tool	I-Application
for	O
source	O
code	O
tagging	O
to	O
aid	O
code	B-General_Concept
comprehension	I-General_Concept
.	O
</s>
<s>
It	O
works	O
in	O
a	O
uniform	O
fashion	O
in	O
various	O
environments	O
(	O
GNU	B-Application
Emacs	I-Application
,	O
Vim	B-Application
,	O
GNU	B-Application
less	I-Application
,	O
GNU	B-Operating_System
Bash	I-Operating_System
,	O
web	B-Application
browsers	I-Application
,	O
etc	O
.	O
</s>
<s>
It	O
is	O
particularly	O
useful	O
for	O
working	O
on	O
projects	O
containing	O
numerous	O
sub-projects	O
and	O
complex	O
syntax	O
trees	O
generated	O
by	O
the	O
compilation	O
process	O
(	O
e.g.	O
,	O
C	B-Language
code	O
containing	O
numerous	O
#ifdef	O
directive	O
which	O
select	O
among	O
several	O
main( )	O
functions	O
using	O
conditional	O
compilation	O
)	O
.	O
</s>
<s>
It	O
is	O
similar	O
to	O
older	O
tagging	O
software	O
such	O
as	O
ctags	B-Device
and	O
etags	O
,	O
but	O
differs	O
in	O
its	O
independence	O
from	O
any	O
specific	O
text	B-Application
editor	I-Application
.	O
</s>
<s>
GNU	B-Application
GLOBAL	I-Application
is	O
free	B-Application
software	I-Application
maintained	O
for	O
the	B-Application
GNU	I-Application
project	I-Application
by	O
Shigio	O
Yamaguchi	O
.	O
</s>
<s>
Use	O
cases	O
are	O
varied	O
,	O
and	O
include	O
traversing	O
the	O
source	O
code	O
of	O
the	O
Linux	B-Operating_System
kernel	I-Operating_System
,	O
browsing	O
Ruby	B-Language
code	O
after	O
having	O
analyzed	O
it	O
with	O
Exuberant	O
ctags	B-Device
or	O
rtags	O
,	O
examining	O
the	O
structure	O
of	O
software	B-Application
packages	I-Application
in	O
HTML	B-Language
mode	O
,	O
or	O
exploring	O
a	O
large	O
and	O
unfamiliar	O
codebase	O
.	O
</s>
<s>
GLOBAL	O
is	O
used	O
by	O
other	O
software	O
,	O
including	O
GNU	B-Application
Automake	I-Application
.	O
</s>
<s>
FreeBSD	O
uses	O
it	O
in	O
its	O
build	B-Application
system	I-Application
.	O
</s>
