[virt-tools-list] How the use the 'Preferences' function in the Virt-viewer

[hongzhen_luo at sina.com]

 Hello 
      Do you know how to use  the 'Preferences' function in the Virt-viewer ?  I have tried so many methods ,but unfortunately , the folder sharing was always cannot be used (In the Perferences Window ,All of items were dimmed state ) ..(virt-viewer-x86-3.1/Host: Win7 OS 32bit / Guest : win7 OS 32bit)      I am not sure my operation was correct ,because this's my first time to use this function . So if you know that , please tell me the details about this function and  please  teach me  how to use it .Thank you very much .. 
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