Granting Guest Privileges to a Web Server Computer
   
To grant guest privileges to a Web server computer
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On the Windows NT® data source computer, click Start, point to Programs, and click Administrative Tools.
 
 
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Run User Manager for Domains. 
 
 
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From the User menu, click Select Domain. Enter the current computer name and click OK.
 
 
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In the lower window, double-click the Guests group and click Add to add the computer name account, which by default would be IUSR_MYWEBSVR (where MYWEBSVR is the name of your Web server).