Thank you, Hans and Angus, for your replies.
My program put up a convention-specific form, printed the label (which was created in Dymo Form Designer--the API transfers data from the calling program to the label by field name), and recorded the interaction, keeping a running tally. ("Convention-specific" means, for instance, that some choices are constrained in combo lists, "Badge Name" is copied from "Member Name" with the ability to change it if the member wishes, stuff like that.) The idea was to make everything easier for the registration staff, who will be working under pressure.
I believe that I do have the old Dymo SDK. There was some business about using Delphi on one of the files there to create a Delphi Type Library which can then be used in a Delphi program. I forget just where I learned that Delphi has changed how this works, and I don't know how big this change was.
I do have the current Dymo SDK. There used to be a Dymo Developers Forum where I once got useful advice, but it seems to be no longer in operation. The previous SDK had a set of Delphi samples, but unfortunately the current one does not. I can certainly experiment with the current stuff, but I had hoped to get a bit of a headstart here. I will try to investigate and adapt some of the current-SDK stuff.
Interesting idea about using an all-Delphi solution to print directly to the printer, Hans--I'll try to investigate that. One of my aims was to distribute the program, allowing future users the freedom to design (using Dymo Form Designer) their own labels in various shapes and sizes, without having to build them into the Delphi program (or have the label size and shape parameters entered separately, which would be additional complication that the Dymo SDK provides for the developer.)
I'm retired, and had put all this stuff on the shelf for quite a while; I only resumed active Delphi development recently. (Thank you Embarcadero, for the Community Edition!). I know that there used to be a number of Delphi fora/communities, but it seems as if this is the primary one now. Are there any others that would be worth trying?
Many thanks. --Howard