A Windows 95/98 program that detects Back Orifice (BO) packets destined to the machine it's running on. When such packet is received, NOBO logs the IP address and host name it came from, along with the BO operation (such as file delete, system info, etc.). Also, NOBO can be configured to reply back a text message to the BO client; such message is displayed on the BO client screen everytime a BO packet is sent to the machine running NOBO. NOBO is small and simple to install. Actually no installation is required; justgrab the executable and run it.