Windows Folders Sharing (Windows XP)
To get full control of your Folder sharing options, you may need to modify the Folder Options settings.
In the Windows explorer menu, select ‘Tools’. In the ‘Tools’ pull-down menu, choose the ‘Folder Options’. The Folder Options window has a ‘View’ Tab which lists the Advanced Settings. In the Advanced Settings, untag the ‘Use simple file sharing’ (see Dutch example below):
You may apply these settings only to one folder or all folders. Once this setting is applied, you will be able to control the access by user and by access type (read/write/etc.).
Read also the NetBIOS security settings.