Keyboard Entry
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 Reference Item | Description
                |
 CLEAR TYPEAHEAD| Empty the keyboard buffer
 INKEY()        | Extract a character from the keyboard buffer
 KEYBOARD       | Stuff a string into the keyboard buffer
 LASTKEY()      | Return the INKEY() value of the last key in the buffer
 NEXTKEY()      | Read the pending key in the keyboard buffer
 SET TYPEAHEAD  | Set the size of the keyboard buffer
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