https://docs.mql4.com/basis/variables/inputvariables for sinput
Never heard of the other two.
from 'Input variables' topic, MT4 help:
However, there is one exception to this rule:
can be varied in optimization tasks using ParameterSetRange() function. This
function has been introduced specifically for the program control of available
values sets for any input
variable including the ones declared as static input (sinput). The
ParameterGetInput() function allows to receive input variables values when
optimization is launched (in OnTesterInit() handler) and to reset a change step
value and a range, within which an optimized parameter values will be
Obviously it is not implemented. And probably a typo, referring to ParameterGetRange().
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