(usually=name not found on DomainNameServer)
(b) Brief help (with no parameter) = ERRORLEVEL 1
Note: for PING Brief help with /? switch, ERRORLEVEL is 0
(c) Invalid switch = ERRORLEVEL 1
(and displays the Brief help as well)
(d) Interrupted with [Ctrl-C] = ERRORLEVEL 255
SORT.EXE
(a) Invalid switch = ERRORLEVEL 1
(b) Drive not ready (Abort reply) = ERRORLEVEL 15
(Note: Fail reply returns ERRORLEVEL 0)
START.EXE
(a) start /? (real mode) = ERRORLEVEL 1
(b) start /? (GUI) = ERRORLEVEL 255
(c) Can't find file specified for START = ERRORLEVEL 255
(d) No file association for specified file = ERRORLEVEL 255
(e) Drive not ready = ERRORLEVEL 255
(There is no Abort, Retry, Fail stall)
SUBST.EXE
(a) Invalid parameter = ERRORLEVEL 1
(b) Invalid switch = ERRORLEVEL 1
(c) Path not found = ERRORLEVEL 1
(d) Drive not ready (Abort reply) = ERRORLEVEL 21
