Hi, Asutosh.
One way would be to have a hidden iGrid object on your page that refreshed at some time interval. Associated with that grid would be a SQLQuery that queried a table listing "messages" for a particular user. Other apps could simply insert a row into the database to "send" a message. There is a session parameter which identifies the currently logged in user's name which you could link to a query parameter.
You could display this in the status bar using the window.status method, or you could make the iGrid visible in the header of the xMII portal as a "message list". Alternatively, you could use the iTicker applet and scroll automatically through all of the users' messages.
Rick
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