impulse
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impulse is a console command available in all 
GoldSrc games.
It is a generic client-side console command that is used to send commands to the server without modifying the usercmd.
The advantage is that new commands can be added without compatibility-breaking networking changes; the disadvantage is that only one impulse can be sent at a time, and that the commands themselves are non-descriptive.
Syntax:
impulse NUMBER
Impulse commands are generally used for development functions and/or cheats, and almost all require sv_cheats. See CBasePlayer::ImpulseCommands(), CBasePlayer::CheatImpulseCommands()
Impulses
General
| # | Notes | Description |
|---|---|---|
| 76 | Spawn monster_human_grunt | |
| 100 | Not a cheat | Toggle the player flashlight. Requires item_suit. Bound to F by default. |
| 101 |  - Gives all weapons and suit
| |
| 102 | Spawns 1 random human gib (model "models/hgibs.mdl" with randomly set body) at player's location. [1] | |
| 103 | Prints AI state of the CBaseMonster entity the player is looking at to the console. Requires developer 1. | |
| 104 | Dumps global states to console (in  it would be done by command dump_globals)
| |
| 105 | Toggles between player being silent/audible. Npcs won't hear silent player. | |
| 106 | Prints the classname, targetname, model and also globalname if non-empty of the entity under the crosshairs to the console. | |
| 107 | Prints the material that player is looking at to console. | |
| 195, 196, 197 | Nonfunctional[confirm] | Supposed to show the shortest path to the nearest air, large, and human nodes respectively. |
| 199 | show nearest node and all connections | |
| 201 | Not a cheat | Creates a player spray on the brush under the crosshair. Use Options, Multiplayer to set a spray. Default key is T. |
| 202 | Spray blood over the brush under the crosshair. | |
| 203 | Removes the entity under the crosshairs only if it can take damage. (seems to be usable only on npcs) |
Half-Life
| # | Notes | Description |
|---|---|---|
| 99 | Not a cheat | If this command was submitted to the console at least three times, this will show the Valve, Sierra Studios and Half-Life logo rotating on the upper right-hand corner of the screen. Works on WON, Steam versions. This command does not work with 1280x720/1280x960 or higher resolutions after 25th Anniversary Update, because the game would fail to find the "sprites/1280_logo.spr" file. This command was used during E3 1998, as seen on the small television screens showcasing gameplay videos of Half-Life. |