<s>
The	O
programmer	B-Application
's	I-Application
key	I-Application
,	O
or	O
interrupt	B-Application
button	I-Application
,	O
is	O
a	O
button	O
or	O
switch	O
on	O
Classic	O
Mac	O
OS-era	O
Macintosh	B-Application
systems	I-Application
,	O
which	O
jumps	O
to	O
a	O
machine	B-General_Concept
code	I-General_Concept
monitor	I-General_Concept
.	O
</s>
<s>
On	O
most	O
68000	B-Device
family	I-Device
based	O
Macintosh	B-Device
computers	I-Device
,	O
an	O
interrupt	B-Application
request	O
can	O
also	O
be	O
sent	O
by	O
holding	O
down	O
the	O
command	O
key	O
and	O
pressing	O
the	O
power	O
key	O
on	O
the	O
keyboard	O
.	O
</s>
<s>
This	O
effect	O
is	O
also	O
simulated	O
by	O
the	O
68000	O
environment	O
of	O
the	O
Mac	B-Operating_System
OS	I-Operating_System
nanokernel	I-Operating_System
on	O
PowerPC	O
machines	O
and	O
the	O
Classic	O
environment	O
.	O
</s>
<s>
A	O
plastic	O
insert	O
came	O
with	O
Macintosh	B-Device
128K	I-Device
,	O
Macintosh	B-Device
512K	I-Device
,	O
Macintosh	B-Device
Plus	I-Device
,	O
and	O
Macintosh	B-Device
SE	I-Device
computers	O
that	O
could	O
be	O
attached	O
to	O
the	O
exterior	O
of	O
the	O
case	O
and	O
was	O
used	O
to	O
press	O
an	O
interrupt	B-Application
button	I-Application
located	O
on	O
the	O
motherboard	O
.	O
</s>
<s>
Modern	O
Mac	B-Device
hardware	O
no	O
longer	O
includes	O
the	O
interrupt	B-Application
button	I-Application
,	O
as	O
the	O
Mac	B-Application
OS	I-Application
X	O
operating	O
system	O
has	O
integrated	O
debugging	O
options	O
.	O
</s>
<s>
In	O
addition	O
,	O
Mac	B-Application
OS	I-Application
X	O
's	O
protected	O
memory	O
blocks	O
direct	O
patching	O
of	O
system	O
memory	O
(	O
in	O
order	O
to	O
better	O
secure	O
the	O
system	O
)	O
.	O
</s>
