Half-Life - Day of Defeat

Cheat Codes:
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Press ~ during game play to display the console window. Then,
enter one of the following codes.

Result                       Code
---------------------------------
Change brightness          - lightgamma
Change frame rate          - fps_max 
Disable background sounds  - stopsound
MP# player                 - mp3
Disable crosshair change   - [Space]cl_dynamic_xhair 0

Numerical Ping: 
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To display numbers along with dots for latency on a server 
type -numericping in the shortcut's target line.