Bus Debugging

This is not about debugging a computer bus. It is about debugging on a bus. More correctly, it is about debugging software running on a bus, not on a computer bus but on a real bus. Some time ago I was on a bus leaving Dublin bus station to Dublin airport. Looking around inside the bus I noticed one monitor had a characteristic Windows XP-style message box of an access violation. It was just before disembarking the bus that I made a mental effort to memorize the referenced memory address: 0×4000 and the instruction address: x73f18a09. The application name was bb.exe. Google search for 73f10000 module load address points to this one:

ModLoad: 73f10000 73f6c000   C:\WINDOWS\system32\DSOUND.dll