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as O
well O
) O
, O
but O
it O
is O
commonly O
used O
to O
help O
maintain O
multiple O
configuration B-Protocol
files I-Protocol
in O
multi-boot O
scenarios O
. O
For O
example O
, O
with O
SYS O
/L O
/DR:703 O
the O
written O
Volume B-Device
Boot I-Device
Record I-Device
would O
look O
for O
a O
renamed O
and O
modified O
IBMBIO.703 O
system O
file O
( O
instead O
of O
the O
default O
IBMBIO.COM O
) O
and O
the O
IBMBIO.703 O
would O
look O
for O
IBMDOS.703 O
and O
[D]CONFIG.703 O
( O
instead O
of O
IBMDOS.COM O
and O
[D]CONFIG.SYS O
) O
, O
so O
that O
multiple O
parallel O
sets O
of O
files O
can O
coexist O
in O
the O
same O
root B-Application
directory I-Application
and O
be O
selected O
via O
a O
boot-loader O
like O
LOADER O
, O
supplied O
with O
Multiuser B-Operating_System
DOS I-Operating_System
and O
DR-DOS O
7.02/7.03 O
. O
The O
SHELL O
directive O
is O