Function            getVolSerialNum - get Volume Serial Number
                                          (DOS 4.x)

  Syntax              boolean getVolSerialNum(int drive, unsigned long
                                              *serialnum);

  Prototype in        doshk.h

  Remarks             gets the Volume Serial Number for a disk determined
                      by drive, where 0=A, 1=B, etc. serialnum must be a
                      pointer to an allocated piece of memory. This
                      function only works for DOS versions 4.x and later.

  Return value        returns TRUE if successful, otherwise returns FALSE
                      with the DOS error code in the global variable
                      errno.

  See also            getBootBlock(), getBootBlock4(), getBPB()

  Example             #include <doshk.h>

                      main()
                      {
                           unsigned long serialnum;

                           if (getVolSerialNum(&serialnum))
                                printf("Got it: %lu",serialnum);
                           else
                                printf("Error");
                      }