Shows a HUD message to a client on the given channel.
As of this writing, only TF, HL2MP, and SourceForts support HUD Text.
int ShowHudText(int client, int channel, const char message, any ...)
Client index to send the message to.
A channel number. If -1, then a channel will automatically be selected based on the least-recently-used channel. If the channel is any other number, it will be modulo'd with the channel count to get a final channel number.
Message text or formatting rules.
Message formatting parameters.
-1 on failure (lack of mod support). Any other return value is the channel number that was used to render the text.