Mail defines the following default keypad on the VT100/LK201:

                 +---------+---------+---------+---------+
                 | PF1     | PF2     | PF3     | PF4     |
                 |         |         |         |         |
                 |   GOLD  |   HELP  |EXT/MAIL | ERASE   |
                 |         |DIR/FOLD | EXTRACT |SEL MAIL |
                 |---------|---------|---------|---------|
                 | 7       | 8       | 9       | --      |
                 |         |         |         |         |
                 | SEND    | REPLY   |FORWARD  |READ/NEW |
                 |SEND/EDIT|RP/ED/EX |FRWD/EDIT|SHOW NEW |
                 |---------|---------|---------|---------|
                 | 4       | 5       | 6       | ,       |
                 |         |         |         |         |
                 | CURRENT |  FIRST  |  LAST   | DIR/NEW |
                 |CURR/EDIT|FIRS/EDIT|LAST/EDIT|DIR MAIL |
                 |---------|---------|---------|---------|
                 | 1       | 2       | 3       |ENTER    |
                 |         |         |         |         |
                 |  BACK   |  PRINT  |   DIR   |         |
                 |BACK/EDIT|P/P/NOTI |DIR/9999 |         |
                 |---------+---------|---------| ENTER   |
                 | 0                 | .       | SELECT  |
                 |                   |         |         |
                 |       NEXT        | FILE    |         |
                 |     NEXT/EDIT     | DELETE  |         |
                 +-------------------+---------+---------+