PF12 doesn't work on KDE

Question
PF12 doesn't work on KDE

Answer
KDE reserves the F12 key for "Mouse Emulation", so x3270 cannot use this key. To allow x3270 to use F12, pull up the KDE Control Center, look under "Look & Feel", and under that, "Key Bindings". Remove the binding for F12.

Note that KDE reserves a number of other hotkeys that could interfere with x3270 keymaps.