Explain here what cvars are and how to use them client and server

Peenus deo gloria.

Make your server “invite-only” and only allow players that you specify to join the server. [set acl “Some_Nick Another_Nick Yet_Another_Nick”]

Displays how many ACS P-Code instructions were executed when a script stops or delays.

The color of the automap background. Changes to this cvar take effect the next time the automap is activated.

The color of two-sided lines that have a different ceiling height on each side.

The status of the automap cheat. This value can be changed directly from the console to cheat, or it can be modified the old fashioned way with cheat codes. Valid values are:

• 0: No cheat. Only level architecture the player has seen is shown.
• 1: All architecture is shown, regardless of whether or not the player has seen it. Equivalent to one input of the Doom iddt cheat.
• 2: In addition to the previous, shows all things in the map as arrows pointing in the direction they are facing. Equivalent to two inputs of the Doom iddt cheat.
• 3: In addition to the previous, all things are wrapped in a box showing their size. There is no iddt cheat for this, as this functionality was added to ZDoom and is not a carryover from vanilla Doom.
• 4-6: They are the same as modes 1-3, respectively, except that lines flagged as “hidden” are not shown.

The color of two-sided lines that have a different floor height on each side.

The color of the automap grid.

The color of inter-level teleporters. These are teleporters that teleport you to a different map.

The color of intra-level teleporters. These are teleporters that teleport you to a different location on the same map.

The color of lines that open locked doors.

The color of lines on the automap that haven't yet been seen. Visible with a computer area map.

The color of passable lines on the automap when the map is overlayed.

The color of teleporters (both inter- and intra-level) on the overlayed automap.

The color of things visible with the automap cheat when the map is overlayed.

Sets the transparancy of the overlay automap.

The color of unseen lines on the automap when the map is overlayed.

The color of impassable walls when the automap is overlayed.

The color of the arrow representing the player in single player games when the map is overlayed.

Normally, the automap is always drawn such that north is at the top of the screen. Setting this cvar to “1” causes the automap to be drawn so that lines toward the top of the screen are always directly in front of the player's view. This can be particularly useful when the automap is overlayed.

The color of lines that are marked secret when you are using am_cheat. When you aren't using the automap cheat, secret walls are drawn the same color as one-sided lines.

When true, the fullscreen automap will display a count of all the “special” items you have found on the map. These are the same items that are used to determine the Items stat on the intermission screen.

When true, the fullscreen automap will display a count of the number of monsters that have been killed in the current level and the total number of monsters in the level.

When true, the fullscreen automap will display a count of the number of secrets that have been found in the current level and the total number of secrets in the level.

When true, the fullscreen automap will display the total amount of time you have been in a level (excluding time that has been paused).

Sets what type of automap you want; 0 (Standard), 1 (Overlay) and 2 (Both).

The color of things revealed with the map cheat. Note that certain types of things can have a different color, as indicated by the following CVARs.

The color of two-sided lines that don't have any difference in floor or ceiling heights on either side. Only seen using map cheat.

When set to true it uses the colors set in am_ cvars. When false the default colors will be used.

The color of one-sided and secret walls in the automap.

The color of the “crosshair” dot in the center of the automap.

The color of the arrow representing the player in single player games.

This represents the minimum vertical distance from an object that the player's sight must be before that object is no longer autoaimed at. Setting this cvar to “0” disables autoaiming, while large values such as the default 5000 will reproduce the original DOOM behavior of always autoaiming.

This cvar keeps track of the number used for the next automatic save and is updated each time an automatic save is made. You cannot change it from the console.

Allows players without doom.wad/doom2.wad to use freedoom as an alternative whenever possible.

Specify an internet location of a custom banlist text file that will be periodically fetched by your server.

Controls the background color brightness of the scoreboard and sitrep.

Controls the background color opacity of the scoreboard and sitrep.

A number representing the color of the next bot to be spawned. Possible values range from 0 to 11, 11 meaning that the bot will use its own color as defined in bots.cfg.

When set to 1, the player will experience minimal interaction with the world, and bots will ignore him. Does not work in netgames.

Controls if bullet puffs are drawn or not.

Toggles the chasecam on and off. Chase mode is disabled in competitive modes. In Coop modes it is enabled by default, but can be disabled with cvar sv_nochasemode. The distance and height of the view can be set with client cvars chase_dist (0…1000 range) and chase_height (-100…100 range).

This is how far away from the player the chasecam likes to be, but it will get closer as necessary to avoid going inside walls.

This is the base height above the top of the player's head at which the chasecam will be positioned. Looking up and down will move the camera in the opposite direction so that the player stays at approximately the same height on the screen.

Sets which message will be send when using hotkey 0 in chat.
To use these, enter chat mode and then hold down Alt and press one of the number keys. The string stored in the corresponding chatmacro cvar will be sent as if you had typed it yourself.

Sets which message will be send when using hotkey 1 in chat.
To use these, enter chat mode and then hold down Alt and press one of the number keys. The string stored in the corresponding chatmacro cvar will be sent as if you had typed it yourself.

Sets which message will be send when using hotkey 2 in chat.
To use these, enter chat mode and then hold down Alt and press one of the number keys. The string stored in the corresponding chatmacro cvar will be sent as if you had typed it yourself.

Sets which message will be send when using hotkey 3 in chat.
To use these, enter chat mode and then hold down Alt and press one of the number keys. The string stored in the corresponding chatmacro cvar will be sent as if you had typed it yourself.

Sets which message will be send when using hotkey 4 in chat.
To use these, enter chat mode and then hold down Alt and press one of the number keys. The string stored in the corresponding chatmacro cvar will be sent as if you had typed it yourself.

Sets which message will be send when using hotkey 5 in chat.
To use these, enter chat mode and then hold down Alt and press one of the number keys. The string stored in the corresponding chatmacro cvar will be sent as if you had typed it yourself.

Sets which message will be send when using hotkey 6 in chat.
To use these, enter chat mode and then hold down Alt and press one of the number keys. The string stored in the corresponding chatmacro cvar will be sent as if you had typed it yourself.

Sets which message will be send when using hotkey 7 in chat.
To use these, enter chat mode and then hold down Alt and press one of the number keys. The string stored in the corresponding chatmacro cvar will be sent as if you had typed it yourself.

Sets which message will be send when using hotkey 8 in chat.
To use these, enter chat mode and then hold down Alt and press one of the number keys. The string stored in the corresponding chatmacro cvar will be sent as if you had typed it yourself.

Sets which message will be send when using hotkey 9 in chat.
To use these, enter chat mode and then hold down Alt and press one of the number keys. The string stored in the corresponding chatmacro cvar will be sent as if you had typed it yourself.

Turns the blinking “Domination” messages on / off.

Turns the drawing of Bloodspat Decals in SP and Online on / off.

Chooses whether actors “bleed” sprites, particles, or both when they are hurt.

• 0: Blood is drawn as sprites
• 1: Blood is drawn as both sprites and particles
• 2: Blood is drawn as particles only

When true the camera will switch to chasecam when the player dies. It will turn back when respawn or spectating another player.

Enables coloring of the railshots according to the shooter's color (railshots coming from monsters will have a rainbow coloring).

Controls the intensity of the yellow flash a player sees when picking up a flag. Range from 0 (no flash) to 4.

Controls the number of dead bodies displayed. It can range from 3 to 32;

Selects the maximum number of decals present at once on the current map.
Decals are graphics that are placed on walls in response to blood splatter and projectile impacts. Setting this to 0 will disable decals entirely.

Enables exploding missiles to leave scorch marks.

Controls how bullet puffs are drawn. Supported values are:

• 0: Puffs are drawn as sprites
• 1: Puffs are drawn as particles
• 2: Puffs are drawn as both, sprites and particles

Enables showing the rank and spread in display.

Controls whether or not rockets leave trails of smoke behind them. Supported values are:

• 0: No rocket trail
• 1: Particle trail
• 2: Sprite trail (spawning RocketSmokeTrail or GrenadeSmokeTrail in the wake of the projectile)
• 3: Both particles and sprites

When true, the game will always treat movement commands as if +speed is active, and make the player move at running speed.

controls whether the scoreboard is automatically drawn for dead players.

When disabled the event messages (flag taken, etc.) will not be printed to screen. Event sounds will still play.

Hides/shows the HUD