The web interface offers two principle operations: Area coverage calculations and best server calculations, as well as other functions like path profile analysis. All make use of the settings in the nested menus.
The best server feature requires an existing network of 2 or more sites to work with. To use, pick a previous network from the drop down box (list is refreshed when you login so a reload may be required for recent networks) the click the 'Check' button. A request will go the server and a progress bar will appear. It will search around cursor location on the map to find the nearest towers in the network you select. From those towers it will compute the received power and return a list of results. For best server the cursor location represents the receiver location and you can change the receiver height and gain from the form. Changing the transmitter parameters will make no difference as best server will take the parameters from your archive for that network.