The whole issue of which characters are allowed in usernames is based on the fact that, when a person logs in to the database, a file is created with the username as part of the file name. I know that there are a number of characters that are not allowed in file names. The only ones that I'm sure are allowed are the English letters and numbers.

Can you create -- and access -- a file that has these characters in its name?

JPD
http://www.jpdeni.com/dbman/