DECS intercept docs created by a Java or LS agent?

Does DECS intercept documents created/updated by a Java or LS agent? I've setup a RT activity in Domino writing data back to an DB/2 table. Now I want to have some scheduled agents update the monitored documents. a) Will the DB/2 values be available on set doc = v.getfirstdocument. b) Will the changes be written back to DB/2 on doc.save ?
In a word, "Yes." You should think of DECS as a wrapper around the document interactions performed by Domino. Any time you make a request (create/update/delete) on a db/document being monitored by DECS the request will intercepted by the DECS server task. That said, your code written in Java and or LS should be acting on the data that DECS servers from DB2. There may be some issues with this working in older versions of R5. If you experience problems you should contact Lotus support. Be sure to have specific details if you call.