They may pair up and see each other, but there is no protocol for them to transfer anything between them. This is the one and ONLY issue I have with the Hero... you cannot even send via BT a contact card (yours) to someone
To my knowledge the included BT profiles on the Hero are as follows:
GAP
SPP
HSP
HFP
A2DP
AVRCP
SDP
There is no OBEX (binary object exchange) for the Hero, the required profile is not included in the phone. Likewise for FTP or APP profiles which are really useful. I mean it's ridiculous I cannot share a picture or video I have taken except for e-mailing... Pretty much all you can do is if lucky obtain hook-up to handsfree and stereo headsets. Some of the 2.x ROM's supposedly have a few of the profiles included allowing greater flexibility on the issue but I am not sure which ROM's have what, so you would have to do you're own homework to find out.
(I had asked several times over at XDA on the Damageless ROM about BT OBEX, FTP, APP and got no reply, so make your own conclusions about that.) Rooting will allow much more flexibility with this issue, I'm sure some of the ROM's have increased BT functionality, I'm just not sure what. If you're rooted there are some app's available as well for this. Anyway...
I have been able to send stuff (files) to my Vista laptop via BT but not in the other direction which confounds me even more... lol... hope that helps some.