In newer versions of HKMP, you can press T to talk in a chat with other connected players or use various useful commands, listed below.
/list - See a list of currently online players/addons {enable/disable/list} [addon(s)] - Manage the addons on the client. It’s possible to disable an addon just for yourself as a player, if the addon supports that functionalitySome commands use an "auth key", which is a unique identifier representing each player. Without this key, anyone could show up with the same name as someone else, and be affected by the commands you used that were meant for someone else. When you insert a username on a command, the mod silently uses that user's auth key instead.
/set {setting name} [value] - Change a server setting. For example, set IsPvpEnabled true allows PVP on the server. See the list of settings further below to see what can be tweaked/ban {name/auth key} - Ban a user from the server. If you provide a name, the ban will only happen if that name is currently connected/unban {auth key} - Unban a user’s auth key from the server/banip {name/auth key/IP address} - Ban a user’s IP from the server. If you provide a name or auth key, the ban will only happen if that name is currently connected/unbanip {IP address} - Unban the IP address from accessing your server/kick {name/auth key/IP address} - Kick the user/whitelist {arguments} - Manage the whitelist settings, which lets you allow only specific players to join your server
whitelist {on/off} - Enable or disable the whitelistwhitelist {add/remove} {name/auth key} - Add or remove the given username or auth key to/from the whitelist. If a given username isn't currently online, it will be added to the 'pre-list', which whitelists the first person to join with that namewhitelist clear - Clear the whitelistwhitelist clear prelist - Clear the whitelist’s pre-list/auth {name/auth key} - Authorize a user name or auth key to use administrator commands/deauth {name/auth key} - De-authorize user name or auth key from using admin commands/announce {message} - Broadcast a chat message to all connected players/exit - Close the server gracefully and disconnect all players/log {level(s)} - Modify which level of logging you want to see in the server console