You can ... however it will require you to have a sync with the DLL and also export what you want to send to it into a seperate file which it looks for.
It can be more trouble than worth!
I'd suggest making one in C and using Borland Builder (use 5.5, not any above as they all contain clauses for retail use) ... if you actually have a $70/€120/£95 then get MSVC++ 6.0
i'm actually hoping that as DBpro is plugin based (probably builds a compiled DLL within the program with the used functions) that we can finally call DLLs properly ... as in DB 1.1x it was a hit and miss for calling them with thier proper names - as sometimes they worked and sometimes they didn't was quite annoying.
Holy jumping mother of god NOOOO!!!...