env_message
env_message is a point entity available in all 
GoldSrc games. It draws a text message on player HUDs
Key Values
Targetname:
- Name
(targetname)<targetname> - The targetname that other entities refer to this entity by.
Target:
- Target
(???)<target_destination> - The targetname of an entity this entity will trigger when activated.
- Message Name
(message)<string> - Message to be shown.
- Sound Effect
(messagesound)<sound> - When the message is shown, this sound effect will be played, originating from this entity.
- Volume 0-10
(messagevolume)<string> - Volume of the sound effect.
- Sound Radius
(messageattenuation)<choices> - How big the radius of the sound is.
- 0: Small Radius
- 1: Medium Radius
- 2: Large Radius
- 3: Play Everywhere
Flags
- [
1] : Play Once
- [
2] : All Clients
