<s>
Symbolics	B-General_Concept
Document	I-General_Concept
Examiner	I-General_Concept
is	O
a	O
powerful	O
and	O
early	O
hypertext	O
system	O
developed	O
at	O
Symbolics	O
(	O
a	O
manufacturer	O
of	O
high-end	O
workstations	B-Device
)	O
by	O
Janet	O
Walker	O
in	O
1985	O
.	O
</s>
<s>
The	O
Symbolics	B-General_Concept
Document	I-General_Concept
Examiner	I-General_Concept
was	O
first	O
used	O
for	O
a	O
hypertext	O
implementation	O
of	O
the	O
Symbolics	O
manual	O
in	O
the	O
sixth	O
release	O
of	O
the	O
Genera	B-Application
operating	I-Application
system	I-Application
,	O
and	O
was	O
well	O
liked	O
,	O
winning	O
an	O
award	O
from	O
the	O
Society	O
for	O
Technical	O
Documentation	O
.	O
</s>
<s>
The	O
entire	O
manual	O
required	O
10	O
MB	O
of	O
storage	B-Device
space	O
-	O
a	O
significant	O
amount	O
in	O
1985	O
,	O
even	O
on	O
the	O
Lisp	B-Operating_System
machines	I-Operating_System
Symbolics	O
sold	O
.	O
</s>
<s>
The	O
Symbolics	B-General_Concept
Document	I-General_Concept
Examiner	I-General_Concept
used	O
a	O
hierarchical	O
structure	O
,	O
which	O
differed	O
from	O
other	O
experimental	O
hypertext	O
systems	O
;	O
it	O
apparently	O
was	O
partially	O
inspired	O
by	O
an	O
even	O
earlier	O
hypertext	O
system	O
,	O
the	O
precursor	O
to	O
Texinfo	B-Application
which	O
originated	O
with	O
Emacs	B-Application
.	O
</s>
<s>
Symbolics	B-General_Concept
Document	I-General_Concept
Examiner	I-General_Concept
users	O
could	O
add	O
bookmarks	O
,	O
which	O
allowed	O
returning	O
to	O
specific	O
items	O
easier	O
;	O
this	O
method	O
was	O
later	O
incorporated	O
in	O
graphical	O
web	B-Application
browsers	I-Application
.	O
</s>
<s>
The	O
biggest	O
drawback	O
to	O
the	O
Symbolics	B-General_Concept
Document	I-General_Concept
Examiner	I-General_Concept
was	O
that	O
users	O
could	O
not	O
make	O
changes	O
to	O
any	O
information	O
or	O
to	O
a	O
document	O
's	O
navigation	O
.	O
</s>
