As most blind persons are quite comfortable with the dialing operations of the telephone, most of the commands to the e-mail reader are given in terms of keypad sequences.
Facilities are available to forward, reverse, pause and stop reading a mail.
A large organisation may have several independent ethernets in various buildings separated by distances of a few kilometres. These can be interconected via 64 Kbps - 1 Mbps serial lines. Software on the bridge forwards only those Ethernet packets that are destined for a remote machine. The software dynamically adapts to changes in the network configuration. To these, the bridged Ethernets appear to be a single Ethernet.