OR tf1 tf2
(OR tf1 tf2 tf3 ...)
outputs TRUE if any input is TRUE, otherwise FALSE. All inputs
must be TRUE or FALSE. (Comparison is case-insensitive regardless
of the value of CASEIGNOREDP. That is, "true" or "True" or "TRUE"
are all the same.) An input can be a list, in which case it is
taken as an expression to run; that expression must produce a TRUE
or FALSE value. List expressions are evaluated from left to right;
as soon as a TRUE value is found, the remaining inputs are not
examined. Example:
IF OR :X=0 [some.long.computation] [...]
to avoid the long computation if the first condition is met.