I have uploaded to one of my hosted servers a few files that demonstrate how to use ADS RDD from (x)Harbour.
http://www.main.structuredsystems.com/adssamples/
AdsQuery.prg is a class that allows you to use ADS SQL queries as an object making it simpler to use.
SampleSQLUsage.prg shows how to use the class plus it should answer some of the most common questions most people from Harbour have about ADS. You will see on this .prg how to use stored procedures in default existence of actual ACE wrappers on rddads.lib. It also shows how to create an ADS Data Dictionary.
For your convenience, these samples work with the "LOCAL"/free server and does not depend on any GUI including FW. I'm a FW user but this sample code is aimed at anyone who wants to use ADS from harbour so I made an effort to write the sample as a simple console app.
“Building rddads.lib.pdf" is just text explaining how to build the necessary .libs to use ACE. Building rddads.lib is as simple as compiling 3 files and then linking them into a .lib. Building ACE32.lib is as simple as importing the lib from the ace32.dll.
I hope this sample files helps other take full advantage or make better use of ADS.
Best,
Reinaldo.