Warnings

“End time warning” – user will be warned before his session ends in preset time.
“Traffic completion warning” message appears, when less then indicated value of traffic left.
“Add/change time message” appears when new session starts, or current session changes (prolonged). If you include "%H" ,"%M", "%S" string, left time will appear.
“CTRL+F12” message – pressing this combination user can see time before his session ends. String "%H" ,"%M", "%S" must be included in message, to show time.

See Quick messages to learn more about messages parameters.