Bluetooth was designed as a C and C++ API, but you can use the Windows Sockets interface directly to make a Bluetooth application. (People also sell components you can use with Delphi, but they aren't cheap.)
You might want to check out these MSDN articles:
Bluetooth Programming with Windows Sockets
Bluetooth Reference
That's the best I could google with a short attention span. Good luck!
Duoas
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