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      by the Waite Group
      MicroSoft Press ISBN: 1-55615-262-0
      * Good examples on EVERY command
    Another good book that deals with INTERRUPT programming:
     "MD-DOS 5 Programming"
     by Peter G. Aitken
     MicroSoft Press ISBN: 1-55615-471-2
     * Sample code in QuickBasic and C for MANY interrupt calls
*>  "How do I get a number from a string into an Integer?"  Use:
        X% = VAL(TheString$)
*>  "How do I remove spaces from a string?"
    To remove spaces at the beginning of a string use
       X$ = LTRIM$(TheString$)
    To remove spaces at the end of a string use
       X$ = RTRIM$(TheString$)
    To remove at both beginning and end use
       X$ = LTRIM$(RTRIM$(TheString$))
*>  "What are 'String Descriptors'?"
    Generally you will never need to know this unless you plan to write
    ASM or C routines to use with QuickBasic.  String Descriptors are
    packs of 4 bytes that contain the offset within the DGROUP that the
    actual text of the string starts at and the length of the data.  QB
    does not use ASCIIZ strings (strings that end with a CHR$(0)) so you
    must convert them in your code if you wish to use them with C in
    most cases.  The block looks like:
    2 bytes     Offset within DGROUP
    2 bytes     Length of string data
    Both are UNSIGNED integers (0-65535)
*>  "What is the difference between QBASIC and QuickBasic?"
    A lot!  Some of them are:
    QBASIC will not compile a BAS file into a EXE, QB45 does.
    QBASIC does not have a CALL INTERRUPT, QB45 does.
    QBASIC does not allow use of LIBs, QB45 does.
    QBASIC is a stripped down version of QB45 included with DOS 5.0 and
    above.
    QuickBasic must be purchased.  The retail price varies but should be
    around $65-$80 U.S..
    Generally, almost all BAS code will run in QBASIC. The exception is
    that if is uses INTERRUPTS or outside LIBs, it will not.  There is
    however a CALL ABSOLUTE that does allow SOME access to ASM code but
    it is not simple and the routines must be small. Generally, if you
    are an occasional programmer, QBASIC will do just fine, however, if
    you want to end up with an EXE file or do some serious programming,
    QB45, or PDS would really be the way to go. Other packages available
    are Power Basic and Visual Basic for DOS. These other two packages
    are fine too and provide some additional commands over QB45 but as
    such are not backward compatible to QB45.
*>  "How do I convert from a HEX number to DECIMAL or DECIMAL to HEX?"
    To change from a HEX string to an integer:
      TheString$="6B"
      X%=VAL("&H"+TheString$)
    To change from an integer to a HEX string:
      X$=HEX$(TheInteger%)
*>  "How do I make QuickBasic reboot the system?"
    Here is a simple code snippit to do just this:
    SUB WarmBoot
        DEF SEG = 0
        POKE &h473, &h12
        POKE &h472, &h34
        DEF SEG = &hFFFF
        CALL ABSOLUTE(0)
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