Movement is signaled by tilting the handset and the user can switch back and forth between different robots to control. The actual set-up is a bit convoluted because the Android 1,5 OS in the Hero doesn't support the Bluetoth serial profile. Instead, the Hero is linked by Wi-Fi to a nearby laptop uses its Bluetooth connectivity to link to the robot. Android 2.1 will support the Bluetooth's serial profile, so a Nexus One should be able to make a direct link without the laptop.
HTC Hero CDMA Specifications | Review
source: ENEA via AndroidCommunity