Hi Viv

>What's the maximum number of modules that you are anticipating?

I will keep on adding modules (based on other responses probably I have not used the right word for this, a sale bill data-entry and sale register for me are both different modules) as required.

>IAC the best you can do (size-wise) is to use 1 bit per module rather than 1 character. A double has 64 bits (but, IIRC, only 52 are usable)

I was fiddling with BITTEST() (never was able to use BITSET()), what if I use a hex value can I get more options in? Like I mentioned I already have a provision in my application for a code of 10 characters maybe I could macro (0h&codefld) to get the hex value and then BITTEST()

Please advise.