Thanks for all the inputs, folkses. Sorry to be slow in replying but things got a little crazy here: my new M900 m/c + AOS-5.1 was on my desk, being sniffed at cautiously but with admiration, when the mouse decided to stop moving the pointer. After some ten years it decides to quit after a brief exposure to AOS. Frustrating. (And I'm back on the Windows-10-infested Dell.) However, in my experience, RTFM -- Ranting To Fix Misadventures -- doesn't always work, so one step at a time.
Anyhow, to address points...
(Re: the edm2.com site) Yes, I already found those pages, thanks, but maybe missed the part(s) with the formal skinny on using clipboard functions. Must take another look, RSN (Real Soon Now).
(Re: Martin) Yes, I even read github. As to sharing code, I don't object but until my system gets re-moused and working again the app I have in mind is just that, in my mind. As to drifting off the subject: be my guest; it enlivens the scenery.
(Re: Rich && "Presentation Manager Programming Guide and Reference") Ta. I have it but must delay reading until AOS can help, Windows 10 being (seemingly) clueless -- unless I'm being c/less.
And so to the computer store. Then (maybe) bed.