MESSAGE
The MESSAGE statement displays a character string on the Message line.
 string is a quoted string that contains message text.
 is a CHAR or VARCHAR variable that contains message text.
You can specify any combination of variables and strings for the message text.
4GL generates the message to display by replacing any variables with their
values and concatenating the strings. If the length of the message text exceeds
the width of the screen or 4GL window, the text is truncated to fit. 
References
DISPLAY 
ERROR 
OPEN WINDOW 
OPTIONS 
PROMPT
string is a quoted string that contains message text.
 is a CHAR or VARCHAR variable that contains message text.
You can specify any combination of variables and strings for the message text.
4GL generates the message to display by replacing any variables with their
values and concatenating the strings. If the length of the message text exceeds
the width of the screen or 4GL window, the text is truncated to fit. 
References
DISPLAY 
ERROR 
OPEN WINDOW 
OPTIONS 
PROMPT