Directives

Category	Description
#	Used for documentation comments.
!define	Used to define an identifier.
!error	Used to display an error and stop preprocessor.
[ !if | !ifdef | !ifndef ]	Used for conditional compilation.
!include	Used to include a file.
!message	Used to display a message.
!undef	Used to undefined a previously defined identifier.

Example

!include <init.inc>

!ifndef VERSION
    !define VERSION     "1.0.0"
!endif