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, O
any O
type O
of O
keys O
pressed O
, O
load O
or O
input O
errors O
occurring O
, O
or O
return O
codes O
given O
by O
loaded O
software O
. O
This O
becomes O
particularly O
useful O
since O
INSTALL O
can O
also O
be O
used O
to O
run O
non-resident O
software O
under O
DR-DOS O
, O
so O
that O
temporary O
external O
programs O
can O
be O
integrated O
into O
the O
CONFIG.SYS O
control O
flow O
. O
In O
MS-DOS/PCDOS O
2.0 O
through O
4.01 O
, O
the O
length O
of O
the O
SHELL O
line O
was O
limited O
to O
31 O
characters O
, O
whereas O
up O
to O
128 O
characters O
are O
possible O
in O
later O
versions O
. O
DR-DOS O
even O
accepts O
up O
to O
255 O
characters O
. O
When O
installing O
Windows O
95 O
over O
a O
preexisting O
DOS/Windows O
install O
, O
CONFIG.SYS O