What bluetooth protocol does the iPod Touch use with a keyboard?

Hi...
Say, does anyone know what bluetooth protocol apple is using for their bluetooth keyboards for the iPhone and iPod Touch? It is probably HID, but the people at RIM (i.e. BlackBerry) use SPP. So I would think many 3rd party keyboards use SPP (Serial Port Protocol). But, then, there are many posts about "I wish Apple would support SPP" because people want to build apps that interface with external HW that only supports SPP.
What I want to do? (you ask)
I've one of these nice / expensive Think-out-side portable folding keyboards (good). That only has a serial interface (bad). There are many bluetooth "dongles" out there with serial ports (good). But they only support SPP or Serial Port Protocol (bad? maybe? depends).
See, I know RIM (BlackBerry) people support SPP on their devices. But I haven't heard (found) word one about what the iPod Touch supports. I would hate to spend $80 on one of these dongles and find out it doesn't work.
So, what does the iPod Touch use when talking to the bluetooth keyboard?
-thanks

From page 37 of iOS 4.1 Touch Users Guide:
Using an Apple Wireless Keyboard
For ease of typing, you can use an Apple Wireless Keyboard (available separately;
iPod touch 3rd generation or later).
Regarding the original questions, the BT profiles supported by the Touch arelisted here:
http://support.apple.com/kb/HT3647

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