I am developing a security system using netscape/iis and I want to see if the user is logged on to the network, I wanted to use the server variable("USER_NAME") to check this. I understand that challenge/response must be turned on for this. My problem is that my client is adamant that the user should not be prompted to log in if they have already done so. This is fine in i.e. but netscape insists on requesting a username and password. Is there any alternative to using server variables which will return the clients details. I can get the I.P. address but this is far from satisfactory. Any help given is appreciated.