Thanks Ralph! That clears things up quite a bit. Partly with that information, I was able to learn a little bit more about the exact timeline. Application Development Systems continued doing business from San Jose under that name until about November 1989, when it rebranded as "Centura Software": http://books.google.com/books?id=p-IUhdlrScYC&pg=PA42&dq="Application+Development+Systems"+"Centura"; Soon after that (less than a year), Compuware bought out Centura, primarily to acquire Xpediter and other product called "Navigator": htts://books.google.com/books?id=a4Jp5vySB-UC&pg=PA99&dq="compuware"+"bought+out+centura"
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