Question: The command entered at system prompt mpsdb c:\c8xhll\demo -n MVP1_MP gives me the error message --- PORT CANNOT BE ACCESSED !

Answer: There appears to be a couple of problems here, but most importantly, it appears that the driver is not running. Firstly, the demo program that you are trying to run does not exist. This is our fault, its a typo in the documentation. However, the PORT CANNOT BE ACCESSED error looks to be related to the fact that the driver isn't running (at least that's how we were able to reproduce it). To check this, do the following: 1) go to Control Panel in NT 2) Select Devices Find the SDB in the device list and select start if it happens to be stopped. What this should do for you if you type the above line is to open the debugger, but then it will come back with an error that the file doesn't exist (because it doesn't. Please try starting the driver in the above manner and see if that allows you to open up the debuggers.