1. Launch your Steam client.
   
   
2. Go to your Library
   
   
3. Right-click the Counter-Strike 1.6 → Properties
   
   
4. In the General tab, look for the section called Launch Options.
   
   
5. Type the commands you want there.
   
   
6. Close the window, it saves automatically.
   
   
7. Start your game, and the launch options will take effect every time you run it.

+map_background none -novid
-noforcemaccel ; Use desktop mouse acceleration settings
-noforcemspd ; Use desktop mouse speed settings.
-noforcemparms ; Use desktop mouse buttons settings.
-noaafonts ; Disables Anti-Aliasing of Screen Fonts.
-heapsize 262144 ; 512MB System Memory
-heapsize 524288 ; 1GB System Memory
-heapsize 1048576 ; 2GB System Memory
-w = width | -h = height
-w 640 -h 480 ; 640x480
-w 800 -h 600 ; 800x600
-w 1024 -h 768 ; 1024x768
-full ; Forces the engine to start in fullscreen mode.
-window ; Forces the engine to start in windowed mode.
-freq 100 ; Changes the Hertz for monitors HL1 Engine. CRT 60-100 85=Common LCD 60-75 72=Common
-soft ; This enables Software hardware rendering mode.
-d3d ; This enables Direct3D hardware rendering mode.
-gl ; This enables Open GL hardware rendering mode.
-nojoy ; Remove joystick support, more ram free.
-noipx ; Disables LAN protocall.
-noip ; Some IP related command remove if unable to connect to servers.
-32bpp ; Enables 32Bit rendering.
-16bpp ; Enables 16Bit rendering.
-dxlevel 90 ; DirectX 9
-dxlevel 81 ; DirectX 8.1
-dxlevel 80 ; DirectX 8
-dxlevel 70 ; DirectX 7
-dxlevel 60 ; DirectX 6
-port 27015 ; Changes your port # for the game.
-console ; When launching Half-Life, this will take you straight to the console.
-dev ; This is for developer mode.
-zone # ; This allocates more memory to scripting files, like autoexec.cfg and so forth.
-game [mod's name] ; Enable Half-Life to play modification games other than to go through the menu to select them.
-safe ; It start the game in safe mode disable audio etc.
-autoconfig ; Restores video and performance settings to default for the current hardware detected.
-condebug ; Logs all console output into the console.log text file.
-nocrashdialog ; Suppresses some 'memory could not be read' unhandled errors.
-novid ; When loading a game with this parameter, the intro Valve video will not play.
-toconsole ; Starts the engine directly in the console, unless a map is specified with +map.
+a +r_mmx 1 ; Instead of using a cfg you can launch the game with a command or a cvar in the command line.
+ex_interp 0.01 ; Sets ex_interp value