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The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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 Programming task                     Keywords included in this list
 ═════════════════════════════════    ═══════════════════════════════════════
 Control program flow                 DO...LOOP, END, EXIT, FOR...NEXT,
                                      IF...THEN...ELSE, GOSUB...RETURN,
                                      GOTO, ON...GOSUB, ON...GOTO,
                                      SELECT CASE, STOP, SYSTEM
 
 Declare constants and variables      CONST, DATA, DIM, ERASE, OPTION BASE,
                                      READ, REDIM, REM, RESTORE, SWAP,
                                      TYPE...END TYPE
 
 Define and call Basic procedures     CALL, DECLARE, EXIT, FUNCTION, RUN,
                                      SHELL, SHARED, STATIC, SUB
 
 Device input/output                  CLS, CSRLIN, INKEY$, INP, INPUT,
                                      KEY (Assignment), LINE INPUT, LOCATE,
                                      LPOS, LPRINT, LPRINT USING, OPEN COM,
                                      OUT, POS, PRINT, PRINT USING, SPC,
                                      SCREEN Function, TAB, VIEW PRINT,
                                      WAIT, WIDTH
 
 Display graphic images               CIRCLE, COLOR, GET (Graphics), LINE,
                                      PAINT, PALETTE, PCOPY, PMAP, POINT,
                                      PRESET, PSET, PUT (Graphics),
                                      SCREEN Statement, VIEW, WINDOW
 
 DOS file system commands             CHDIR, KILL, MKDIR, NAME, RMDIR
 
 File input/output                    CLOSE, EOF, FILEATTR, FREEFILE
                                      GET (File I/O), INPUT, INPUT$,
                                      LINE INPUT, LOC, LOCK, LOF, OPEN,
                                      PUT (File I/O), SEEK Function,
                                      SEEK Statement, UNLOCK, WRITE
 
 Manage memory                        CLEAR, FRE, PEEK, POKE
 
 Manipulate strings                   ASC, CHR$, HEX$, INSTR, LCASE$, LEFT$,
                                      LEN, LSET, LTRIM$, MID$ Function, MID$
                                      Statement, OCT$, RIGHT$, RSET, RTRIM$
                                      SPACE$, STR$, STRING$, UCASE$, VAL
 
 Perform mathematical calculations    ABS, ASC, ATN, CDBL, CINT, CLNG, COS,
                                      CSNG, CVDMBF, CVSMBF, EXP, INT, LOG,
                                      RANDOMIZE, RND, SGN, SIN, SQR, TAN,
                                      TIME$ Function
 
 Set traps for events and errors      COM, ERDEV, ERDEV$, ERL, ERR, ERROR,
                                      KEY (Event Trapping), ON COM, ON ERROR,
                                      ON KEY, ON PEN, ON PLAY, ON STRIG,
                                      ON TIMER, PEN, PLAY (Event Trapping),
                                      RESUME, RETURN, STRIG, TIMER Function,
                                      TIMER Statement