Joined: 23 Nov 2006 Posts: 19270 Location: Inside the Matrix
That might free the terminal, but there are times when the query continues to run without interruption and must be dealt with "from inside".
Most 3270 emulators have a "Settings" clickable. Beneath Settings is usually a Keyboard selection. If you click on Keyboard, you should be able to see which of your keys is mapped to the 3270 ATTN key.