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Reads a character from the keyboard.
 
INKEY$
 
    ■ INKEY$ returns a null string if there is no character to return.
    ■ For standard keys, INKEY$ returns a 1-byte string containing the
      character read.
    ■ For extended keys, INKEY$ returns a 2-byte string made up of the null
      character (ASCII 0) and the keyboard scan code.
 
Example:
    PRINT "Press Esc to exit..."
    DO
    LOOP UNTIL INKEY$ = CHR$(27)    '27 is the ASCII code for Esc.
 
See Also    ◄Keyboard Scan Codes►