Samba: How to switch user when you access to server from Windows?

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http://forums.fedoraforum.org – Hi all ! I have samba server(Fedora 11) here,but when I want to access to it from WindowXP ,the first time you need to tap in user name and password.But the next time ,you automatically log in Samba server with the user name as the first time you used. But I have not clicked the "Remeber me " option when I logged in. I want to switch user when I want to log in samba,does anybody know what is wrong ? Any advice is welcome ,thank you ! Details: security = user passdb backend = tdbsam wins support = yes [samba_folder] path = /samba_folder read only = yes writable = yes browseable = yes guest ok = no (HowTos)