For this example, hostname is anyhost and the file is xauth.info:
myhost% /usr/openwin/bin/xauth nextract - anyhost:0 > $HOME/xauth.info
Mailing the file containing your authorization information is a safer method than using rcp. If you do use rcp, do not place the file in a directory that is easily accessible by another user.
The other user must merge the entry into his/her.Xauthority file.
For this example, userhost merges xauth.info into the other user's .Xauthority file:
userhost% /usr/openwin/bin/xauth nmerge - < xauth.info
The auth-data is session-specific; therefore, it is valid only as long as the server is not restarted.