IF LEN(COMMAND$) THEN
    OPEN "notes.txt" FOR APPEND AS 1
    PRINT #1, DATE$, TIME$
    PRINT #1, CHR$(9); COMMAND$
    CLOSE
ELSE
    d$ = DIR$("notes.txt")
    IF LEN(d$) THEN
        OPEN d$ FOR INPUT AS 1
        WHILE NOT EOF(1)
            LINE INPUT #1, i$
            PRINT i$
        WEND
        CLOSE
    END IF
END IF