Actually, the best place for info on the DDE VIs is Microsoft's website. The functions within LV are apparently very simple wrappers around the Windows function calls so you follow the basic procedural flow in MS's docs and it should work.
Typically you have to open a session specifying a "service" and "topic", you can then "request" (read) or "poke" (write) "items".
And yes, you typically have to read or write one value at a time. It all depends on the "items" that the DDE service you're accessing implements.
Mike...
