<s>
'	O
Sticky	B-Device
keys	I-Device
 '	O
is	O
an	O
accessibility	O
feature	O
of	O
some	O
graphical	O
user	O
interfaces	O
which	O
assists	O
users	O
who	O
have	O
physical	O
disabilities	O
or	O
help	O
users	O
reduce	O
repetitive	O
strain	O
injury	O
.	O
</s>
<s>
It	O
serializes	O
keystrokes	O
instead	O
of	O
pressing	O
multiple	O
keys	O
at	O
a	O
time	O
,	O
allowing	O
the	O
user	O
to	O
press	O
and	O
release	O
a	O
modifier	B-Device
key	I-Device
,	O
such	O
as	O
Shift	B-Device
,	O
Ctrl	B-Device
,	O
Alt	B-Device
,	O
or	O
the	O
Windows	B-Device
key	I-Device
,	O
and	O
have	O
it	O
remain	O
active	O
until	O
any	O
other	O
key	O
is	O
pressed	O
.	O
</s>
<s>
Sticky	B-Device
keys	I-Device
functionality	O
is	O
available	O
on/in	O
Microsoft	B-Application
Windows	I-Application
,	O
macOS	B-Application
and	O
chromeOS	O
as	O
Sticky	B-Device
Keys	I-Device
,	O
and	O
on	O
Unix/X11	O
systems	O
as	O
part	O
of	O
the	O
AccessX	O
utility	O
.	O
</s>
<s>
Sticky	B-Device
Keys	I-Device
was	O
first	O
introduced	O
to	O
System	B-Protocol
6	I-Protocol
as	O
part	O
of	O
the	O
Easy	O
Access	O
extension	B-Operating_System
,	O
which	O
also	O
included	O
mouse	O
keys	O
functionality	O
.	O
</s>
<s>
In	O
1994	O
,	O
Solaris	B-Application
2.4	O
shipped	O
with	O
the	O
AccessX	O
utility	O
,	O
which	O
also	O
provided	O
sticky	B-Device
keys	I-Device
and	O
mouse	O
keys	O
functionality	O
.	O
</s>
