In a computer system, a first electronic data processor is communicatively
coupled to a first memory space and a second memory space. A second
electronic data processor is communicatively coupled the second memory
space and to a network interface device. The second electronic data
processor is capable of exchanging data across a network of one or more
computers via the network interface device. A video processor is adapted
to combine video data from the first and second electronic data
processors and transmit the combined video data to a display terminal for
displaying the combined video data in a windowed format. The computer
system is configured such that a malware program downloaded from the
network and executing on the second electronic data processor is
incapable of initiating access to the first memory space.