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LockVf page
Hi,,
i am working with service console app.. when customer click on chat button means automatically chat box is open at that time visualforce page must be lock..and after some the vf page must be unlock how can i achieve this..
http://stackoverflow.com/questions/1905779/lock-the-screen-with-a-popup-till-the-time-page-gets-loaded-completely
Hope this will help you as a workaround.
http://www.4guysfromrolla.com/articles/121708-1.aspx
An other similar implementation which I came across.