In Debian, the 'write' program does not seem to have the right
permissions to be able to tty's unless it is root.

The problem is that the program does not run with the correct
permissions.  The user does not have access to write to tty's, but the
'tty' group does.

To get write to have access to write to ttys', issue the following two
commands...

       sudo chgrp tty /usr/bin/write
       sudo chmod g+s /usr/bin/write

This makes "write" run as the tty group.  The first like makes tty the
group owner of the executable, and the second like makes the process
run with tty group permissions when run.

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