Defines range of values to be assigned to the index variable in a For/Next loop. See For for details and examples.
For Local IndexVar := start_value To end_value [ Step constant_value ]
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Next
The To keyword defines the range of values through which a For/Next loop will iterate.
An alternative keyword in a For/Next loop (rather than To), with a slightly different action, is Until; see For for further details on this.