Within the SC II editor are the following options for displaying text to players:
-Chat
-Cinematic
-Debug
-Directive
-Error
-Objective
-Subtitle
-Warning
Here is a sample trigger I made in 1 minute, that is designed to show a message to only the player when he presses any key:
http://s3.amazonaws.com/nibbits/gallery%2Fimages%2F20100422194755%2FTrigger_for_Text_Display.1024x768.jpg
With this trigger, you can test where text displays.
As you can see from the followin...