orming simple substitution, might look
like this:
<PRE>&nbsp;&nbsp;&nbsp; #DEFINE&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; VAR1_LO&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (VAR1 &amp; 255)</PRE>
This statement would cause all occurrences of the string 'VAR1_LO' in the
source to be substituted with '(VAR1 &amp; 255)'.

<P>As a more complicated example, using the argument expansion capability,
consider this:
<PRE>&nbsp;&nbsp;&nbsp; #DEFINE&nbsp; ADD(xx,yy)&nbsp;&nbsp;&nbsp; clc\ lda xx\ adc yy\ 