Open two terminals using Exceed in UNIX,Type the following command at the UNIX Shell,Talk [user id ]Eg. Talk godfried

.  Open two terminals using Exceed in UNIX
1.      Type the following command at the UNIX Shell.
Talk [user id ]Eg. Talk godfried
(a)  Briefly explain the concept that enables you to establish a connection using the same user ID.
(b)      Trace the Addresses used by the protocols for this connection via your shell prompt.       
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(a) man talk
(b) man sh; man csh; man bash; man zsh; man ash; man tcsh; man id; man who
if it's a homework, let me just give more hints :)
(a) man tty
(b) man who

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dooh, I missed the tty
but there is also: whoami, who am i, idend, finger, netstat, lsof, ps, .... and many more ...
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Unix OS

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