The two tables at the bottom allow you to determine which keys on the keyboard do NOT sent control codes to the server. "Normal mode" indicates the normal shell mode of the server. "VT100 Keypad mode" indicates the server is in VT100 mode, such as within an editor like "vim". By default, the PageUp and PageDn keys do not send control codes at the normal shell to allow those keys to be used in TeSSH to scroll the scrollback window. However, in "VT100 Keypad mode" the PageUp and PageDn keys are unchecked to indicate those keys should be sent to the server to allow the remote editor to process them (and scroll the file being edited, for example).
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