if i want to give an alert message like "try after sometime" to a web page which is being seen by other person.if a web page is not seen by anyone then it should display otherwise it show a display a message stating that other person is viewing so try after some time........how can i implement this.

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Hi My dear all Friends, There is a question regarding HVAC Engineering and widely used in Power Projects. Question- What is the diffrence Between REF, SEF and Differential Protection....???? Where REF - Restricted Earth Fault SEF - Senstive Earth Fault.

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