With all due respect, I mentioned the C++ app only because Fastlane told that he could not store handles outside the engine. Of course you can also store handles natively inside 3DGS.

But when you store the handles in a database you need a DLL anyway because Gamestudio has no built in database. But thats not Gamestudios fault, most engines have no own database and need an external database.

I am not experienced with MMOG so I cant in depth comment other issues, but the thing I know well is handles because I use them, and I can tell that there is no problem and no workaround required for storing handles.