>(1) IS it necessary to have Macro substitue. ?
>(2) Where and Why Macro Substutes are used ?
>(3) Does use of Macro substitue decreese the processing speed ?
>

Here's my article on macro substitution, EVAL(), name expressions and EXECSCRIPT():

http://www.tomorrowssolutionsllc.com/Articles/Handling%20Code%20that%20Changes%20at%20Runtime.pdf

Tamar