Board Thread:Questions and Answers/@comment-24973829-20140805220220/@comment-5106053-20140806005408

Those are just parameters for the MID$ and LEFT$ functions, the first number is the position of the part of the string that you want, while the second number is the number of characters.

For the position, 0 is at the beginning of the string, 1 is after the first character, 2 is after the second character and so on.

LEFT$ doesn't use a position, it instead just starts at the beginning, so LEFT$(STRING$,1) is the same as MID$(STRING$,0,1).