.Xauthority issue

[Gerhard Magnus]

I'm running Ubuntu 13.04. I've read on the Web that the .Xauthority file 
in my home directory is used to store credentials in cookies used by 
xauth for authentication of X sessions. Meaning I should probably just 
leave it alone. But what about all the other .Xauthority-like files also 
in my home directory with names like .Xauthority.0GWM1W, 
.Xauthoirity.0TJG2W, etc. What are they and can I safely delete them?