A monitoring system includes a data input/output device, a processing
device, a memory device and a transmission device. The data input/output
device is coupled electrically to a host and a managing system for
handling data transmission therebetween. The processing device is used to
verify data that is transmitted to the data input/output device. The
memory device is used to store the data verified by the processing device
therein. The transmission device is adapted to establish a network
connection with the managing system, and is operable so as to selectively
route the data verified by the processing device to the network
connection for reception by the managing system. A method for monitoring
and processing screen data transmitted between a host and a managing
system is also disclosed.