-- Client side
addEventHandler ( "onClientElementDataChange", localPlayer,
    function ( data )
        if ( data == "testElemData" ) then
            outputChatBox ( "CLIENT SIDE: ELEMENT DATA WAS CHANGED" )
        end
    end
)

-- Server side
addEventHandler ( "onElementDataChange", root,
    function ( data )
        if ( data == "testElemData" ) then
            outputChatBox ( "SERVER SIDE: ELEMENT DATA WAS CHANGED" )
        end
    end
)

addCommandHandler ( "setdata",
    function ( thePlayer )
        setElementData ( thePlayer, "testElemData", "HELLO WORLD" )
    end
)

addCommandHandler ( "removedata",
    function ( thePlayer )
        removeElementData ( thePlayer, "testElemData" )
    end
)