<s>
A	O
Manager	O
was	O
any	O
of	O
a	O
set	O
of	O
specialized	O
components	O
of	O
the	O
classic	B-Application
Mac	I-Application
OS	I-Application
operating	B-General_Concept
system	I-General_Concept
,	O
including	O
those	O
that	O
comprised	O
the	O
Macintosh	B-Device
Toolbox	I-Device
.	O
</s>
<s>
Each	O
of	O
these	O
Managers	O
was	O
responsible	O
for	O
handling	O
system	B-Operating_System
calls	I-Operating_System
from	O
applications	B-Application
running	O
on	O
the	O
Macintosh	B-Device
,	O
and	O
could	O
be	O
built	O
into	O
the	O
ROM	B-Device
or	O
be	O
loaded	O
into	O
RAM	B-Architecture
by	O
the	O
system	O
.	O
</s>
<s>
Many	O
of	O
these	O
Managers	O
and	O
their	O
functions	O
have	O
been	O
ported	O
to	O
or	O
re-implemented	O
in	O
the	O
Carbon	B-Operating_System
application	B-Application
frameworks	I-Application
.	O
</s>
<s>
Some	O
of	O
the	O
Managers	O
included	O
in	O
various	O
versions	O
of	O
the	O
Mac	B-Application
OS	I-Application
include	O
:	O
</s>
