>Not a very good example, only the TaxPercentage would be vible for a #define, since the other values are not constants.

Not sure what you mean - the following works as expected:

#DEFINE TaxAmount       _0lO1Ol
#DEFINE InvoiceSubTotal _0lOlOl
#DEFINE TaxPercentage   _0lO1O1

* At runtime, set the values to whatever you want,
* or get a return value from a function, or pass them in as parameters, ...
InvoiceSubTotal = 25
TaxPercentage = 0.12

TaxAmount = InvoiceSubTotal * TaxPercentage

?TaxAmount  && 3

>>You can use #DEFINEs to actually obfuscate your code. Suppose you have some nice readable source code:
>>

>>TaxAmount = InvoiceSubTotal * TaxPercentage
>>

>>Now, let's get cute:
>>

>>#DEFINE TaxAmount         _0lO1Ol
>>#DEFINE InvoiceSubTotal   _0lOlOl
>>#DEFINE TaxPercentage     _0lO1O1
>>

>>What actually gets compiled into your .EXE is
>>

>>_0lO1Ol = _0lOlOl * _0lO1O1
>>

>>So, if someone ReFoxes your code, that's all they get. It makes their life a LOT harder, trying to reverse-engineer your application.