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ReadComm             Read Data From Comm Device Queue

short ReadComm(nCid, lpBuf, nSize)
int nCid;
LPSTR lpBuf; /* Where to put data */
int nSize; /* Maximum number of bytes to read */

Returns:        Number of characters actually read. May be less than
                nSize or negative if error.

Note:           GetCommError may be used to determine cause of error or
                number of characters waiting in the input queue.