The screen is made of 5 different areas, as described below.

The option menu

The menu bar is the area at the top of the window.

It allows the user to join / leave a game session, setup the game settings, log / playback a game, chat and more.

The map

The map is the big area in the middle of the window.

This is where all the game action takes place. Here tanks move, shells explode and life & death decisions are being made.

The ammunition status

The is the status pane in the top-right of the window.

It displays the ammo status of the local tank (guided by the user) during the game.
The user can see the amount of shells, bullets and mines he currently has.

The shield status

This is the status pane in the left area of the window.

Here the user sees the status of it's local tank's shield.
The higher the bar (more blue), the better protection he has.

Once the bar goes completely empty (no shield), any further hits the local tank absorbs - destroys the tank.

The bonus status

This is the status pane in the middle-right area of the window.

Here the user sees the bonus status of the local tank.
If the fast fire rate bonus is lit, the tank can fire shells and bullets twice as fast as it normally can (for a limited time).
If the aerial support (bomb) bonus is lit, the user can summon a bomber for aerial support during the battle.