Function of Refresh Button in Web interface

Hi All,

I have created a web layout in which there is "REFRESH" button.

If i have opened the web layout and i simultaneously do some changes in back end from BW side. After clicking refresh in web interface changes are not reflected.

What exactly the function of "REFRESH" button is??

Also is there any other way through which i can get the changes( done in back end) reflected in my already logged in Web layouts??

Thanks in advance.

Regards.