The following is a brief explanation of controls unique to Day of Defeat: Source. For a complete listing of controls, select "Options" from the main menu in Day of Defeat: Source, then click on the "Keyboard" tab.
Use Voice Communication (default: k)
Lets you speak to your teammates through a microphone. Anything you say into the mic while holding down this key is transmitted to everyone on your team.
Voice Menu (default: c,v,b)
Brings up a quick selection menu of voice commands. Each selection will activate the associated voice signal and a hand signal (where one exists) for that command.
Drop Primary Weapon (default: g)
Drops your current weapon to make room for another weapon. This ability comes in especially handy if you run out of ammo.
Drop Extra Ammo (default: h)
Drops ammo so that a teammate can pick it up. Any class can share ammo with any other class.
Prone (default: z)
In addition to crouching, users can go ‘prone’ - basically meaning they lay on the ground. Machine Gunners can deploy their bipod only when prone. (Or when in an MG Nest area.) A user’s weapon will become temporarily disabled while ‘going prone’ or standing back up.
Sprint (default: SHIFT)
Holding down this key will give you a burst of speed. Stamina drains quickly when sprinting.
Secondary Attack (default: MOUSE2)
Many weapons have a secondary attack option. Secondary Attack with an infantry rifle initiates either a bayonet stab or a rifle butt. For MG's, this key is used to deploy the tripod, while sniper rifles use it to activate the scope.
Pick Up Grenades + Use Item (default: e)
If a grenade lands at your feet, you can pick it up and toss it back with this key. Be careful, though, because grenades have a five second fuse and can easily explode in your hand!
Overview and Mini-Maps (default: m)
Cycles between a full screen overview map, a corner-mounted mini-map, and no map. Very useful for orienting yourself to the objectives and your teammates. Your icon is surrounded by white and is slightly larger than your teammates' icons, which have black borders.