OK, perhaps just a mention that the return when negative numbers are used will not be what you expect. By the way, is VB incorrect when it returns -1 or have they redefined the meaning of MOD to mean just the remainder when you divide by both negative and positive numbers?

The definition in the VFP help file reads 'Divides one numeric expression by another numeric expression and returns the remainder.' I am not a math guy so I just believed the definition given and, therefore, I would expect MOD(-13,4) to return -1.