MSC: unsigned _dos_read( int handle, void far *buffer,

					unsigned count, unsigned *nread )

	- prototype in dos.h

	- handle = opened file handle
	- buffer = receives data read from file
	- count = number of bytes to read
	- nread = receives the number of bytes actually read
	- returns 0 on success or DOS error code

	- Turbo C uses _open()
	- see	INT 21,3F   _dos_open()  _dos_write()  _dos_close()