To irneb,
Thank you again.
I've just done something before reading your post.
These are what I've done:
1) (setenv "computername" "WorkStation_05")
2) (setenv "setcomputername" "WorkStation_05")
I have to change 2 env variables because if the value of one of them doesn't affect the other.
And it works perfectly!
And certainly thanks to Lee Mac and other guys who gave their tips.