OVERLAY substring,string,start[,length]
substring is superimposed to string starting by start. If length is specified, overrides predefined length of substring and so must be <= of this predefined length.
Parameter Name Mode Type coding Remark 1 substring Input String C or X or const. String to write inside; max length 255 char. 2 string Input/Output String C or X String to be overlayed; max length 255 char. 3 start Input Integer F or H or const. Start inside 2nd parameter; first character has position 1 4 length Input Integer F or H or const. If omitted, length is of the first substring
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