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BuildCommDCB        Fill DCB structure as specified in ASCIIZ string
                        like that used with MS-DOS mode command.
short BuildCommDCB(lpDef, lpDCB)
LPSTR   lpDef;  /* COM1:9600,n,8,1 etc */
DCB FAR *lpDCB; /* DCB to fill */

Returns:        Zero if ok, otherwise negative.

Note:           Only fills set those fields that are specified in the string,
                you must set the others!