Specify an alternate command to place an MIT cookie in the .XAuthority file in the user's home directory.
Macros are supported. For example, in the following command, %IP#% provides the IP address and display number, and %C% specifies MIT-MAGIC-COOKIE-1 authorization and provides the required hex encoded authorization data.
xauth add %IP#% %C%
This option is available only when Use alternate xauth command is selected.