I want to login to a remote computer on my LAN,
how do i configure my connection so the other computer
at my LAN can't see my hostname by using
command : w
who
finger
You can't ... at least not in the sense you probably mean.
To make a connection, the "other computer" has to know your IP address. It gets the name it reports in a w or who listing (on my systems, it is an FQN, not a hostname) by doing a reverse lookup of the IP address, using its /etc/hosts file or its dns resolver (whichever way you have it set up ... it doesn't really have any way to see your actual "hostname", if by that you mean the name you put in /etc/hostname). If it cannot resolve the address, it will report the address itself in this location.
So in that limited sense, if you do not provide for reverse lookups, the remote host will not show the *name* of the computer the connection is from ... but it will still show the IP address, which it has to know. Whether this difference accomplishes what you want I do not know, since you haven't said *why* you want to do this.
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