prasad,

As Felix says it's for conditional assembly.

A good exapmle is using it for debugging, you wrap all you debugging code in if-else-endif like this (not sure of the exact format but...


if DEBUG
; do debug code here
endif


Then you can simply define DEBUG for debug mode, and when you build a 'release' version you do not define it, and the debug code is not put into your production version.

It's handly, but can also accidentally introduce alot of bugs! You do find alot of companies release debug version of their code, because the release version is faulty.

Chris