i downloaded the Language Interface 32bit Microsoft Visual Basic 5.0 and tried the sample program "simple scope" (just puts the *IDN?" query and displays the answer) with a HP signal-generator and a Lecroy-DSO. The program set the devices online, was able to read and display the instrument identity but it didn't turn the devices off. The command "ilonl" (compareable/identical ibonl) is for use with the card and the device. If you press "Quit" in the program the card must be turned off though using the device-handle, because reading the identification isn't possible any more (error message).