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I was just now thinking...and I finally figured out how that one guy's scripting engine did it!
You can get the function or subroutine address by using the stack...
the layout of the stack in your dll function will be as so
(starting at the most recent value)
1: function address of the plugin function
2: arguments of plugin function
3: address of callling function(from dbp)
4: arguments of dbp function


This could be very useful in anywhere from making an interpretor, to making callbacks...

I may try to make an example a bit later, but for now wanted to get that brilliant idea out..

edit:
this is assuming that dbp follows the C++ calling method, if it doesn't then I'm not sure it's possible..

Pretty darn close, I'd suggest you walk through with a debugger sometime to see how the stack looks when it enters a dll function. Your list is wrong (but getting closer). Also if you manage to grab the returning address you'll mess up the stack later (causing a process crash) on if you try to use it because you have to know where to start.

This is exactly what i need in order to implement polymorphism into oodbp. I searched the forums yesterday and found a few threads relating to this. It looks like IanM and empty did this years ago in a plugin, but IanM never released his dll, and empty's link in his wip thread no longer works. If you could get this working, or someone else could get a hold of empty's or IanM's dll, that would be excellent.

http://forum.thegamecreators.com/?m=forum_view&t=38083&b=8
http://forum.thegamecreators.com/?m=forum_view&t=37828&b=1