[texhax] writing about 2 parallel developments of a product with the same base code

[Fehd, Ronald J. (CDC/CCHIS/NCPHI)]

Here is the book I recommend for this topic:

Single Sourcing: Building Modular Documentation 
by Kurt Ament 
"Single sourcing is a documentation method that enables you to re-use
the information you develop..." (more) 

http://search.barnesandnoble.com/booksearch/isbninquiry.asp?z=y&pwb=1&ea
n=9780815514916

http://www.amazon.com/Single-Sourcing-Building-Modular-Documentation/dp/
0815514913

Ron Fehd  the {SAS} macro maven  CDC Atlanta GA USA RJF2 at cdc dot gov