Download wc3270 and install
Go to your local application data folder and find the folder for wc3270
Download the keyboard map to a file named mine.wc3270km
Download the connection file to a file named nwrdc_map.wc3270
Create a shortcut to the connection file

The keyboard file defines actions for the F11 and F12 keys
F11 will redraw the screen
F12 will reset the application. Sometimes an illegal key sequence will
freeze the system. F12 will thaw it.