You can provide users with the user name and password of any account on your computer. To help keep your computer secure, you may want to create a special account for Windows users in Accounts preferences.
Because passwords of the user accounts for Windows are stored insecurely, turn off the account when it is not being used. Before you turn off Windows Sharing, turn off all the accounts you enabled. Otherwise, the passwords are still stored insecurely.
If you want to use a user account that existed before you installed Mac OS X Panther, you may need to reset the password for the account using Accounts preferences.