<=                       Less than or Equal to

 exp1 <= exp2

    The <= operator is a relational operator. If the value of exp1 is
    either less than that of exp2 or equal to that of exp2, the result of
    exp1 <= exp2 is -1; otherwise the result is 0. In IF statements, BASIC
    regards 0 as equivalent to FALSE and all nonzero values as equivalent
    to TRUE.

    If the operands are string expressions, BASIC compares the ASCII
    values of the first character in each expression. If the first
    characters have the same ASCII value, BASIC then evaluates the second
    characters, and so on. If one string terminates before the other, and
    the characters in each string are identical to that point, the shorter
    string is considered "less" than the longer one.

   exp1,exp2    Any numeric or string expression, but exp1 and exp2 must
                either both be numeric or both be strings; otherwise a
                Type Mismatch error occurs.