The ALRT method of VPGL Language displays literal representation of input object on the screen by pop-up dialog.
ALRT method takes 1 input and emits 1 output. ALRT starts on arriving object from input 0, pop up a alrert message dialog which displays the string literal representation of input 0 with OK button.
VPGL executor holds this dialog and emits ouput until OK button is pressed. After pressing OK button, this dialog will close and emit the object input 0 to output 0 as passing through.
NOTE: VPGL executor will try to execute other executable tiles as possible even if ALRT operation holds this dialog is displaying.
NOTE: Only one ALRT dialog displays at once. Other ALRT dialogs will be blocked until closing current ALRT dialog.