RUN -- Run a McBASI program
   RUN p1 ... pn FILE= <keywords>
   'filename p1 ... pn <keywords>
   RUN "statement
   '"statement
Parameters:
   p1...pn   | positional parameters read by INPUT statement
   filename  | name of McBASI program to run; extension defaults to .MCB
   statement | McBASI statement(s) to execute immediately (<256 characters)
Keywords:
   Clear=YES | reset values of variables to zero before starting
               program (default when running a program)
        =NO  | variables will retain the values from the previous RUN
               (default when executing statement(s) immediately)
   File= | name of McBASI program to run; extension defaults to .MCB;
           this keyword is required when using RUN, and is invalid when
           using the single quote format (')
   Var=SHARE | shares variables when one McBASI program RUNs another
      =file  | name of LW file to store variable values in after
               running a program; file contents are used to initialize
               variables unless CLEAR=YES is specified (def=BASICVV1)
Remarks:
     RUN will execute a tiny BASIC language program prepared by
     using an ASCII editor.  Here is a list of BASIC reserved words:
     CLOSE  GOSUB  GOTO  IF  INPUT  KEYIN  LET  OPEN  PLOT
     POKE  PRINT  PTABLE  REM  RETURN  SLEEP  STOP

     Variable names= A-Z, A0-Z9, A$-Z$    Statement separator= :

     Arithmetic operators= +  -  *  /  **     String operator= +

     Here is a list of available functions & pseudo functions:
     SIN  COS  TAN  ASIN  ACOS  ATAN  EXP  LN  LOG  ABS  INT  NINT
     MOD  LEN  INDEX  VAL  SQRT  BIN  PEEK  PEEK$  KSYS  KSYS$  STR$
     MID$(a$,first,count)  TIME$  DATE$  DAY$  TFILA$  TFILB$  TFILC$
     TFILD$  TFILE$  EOF$  CHR$  TABLE$  BIN$
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