How can i do that? Is it safe? Why is it disabled by default?
Thanks
/Richard
++
ie: the program to write to other users on my computer.
--
What do you mean by "write"? Send message to another user's terminal with the "write" command, or modify the files of another owner?
Send message to another user...
The destination user must have used the command
mesg y
to enable others to write to his/her terminal. There is no way to override this, as this is a privacy feature.