VT100: Ctrl/W VT200: Ctrl/W or F20 DEFINE_KEY Function: REFRESH Removes TN3270 error messages, operating system messages, or other messages that appear on your screen. This key function deletes extraneous characters from your screen and redisplays the fields and data that were on the screen before the interruption. This function does not transmit or receive data from the remote host. It is a local OpenVMS function.