TC: int _read( int handle, void *buf, int size )

	- prototype in io.h

	- reads "size" bytes from file "handle" into "buf"
	- size must be less than 65534 bytes
	- is a direct call to MS-DOS read function INT 21,3F
	- does not translate CR/LF;  all input in binary
	- returns number of bytes successfully transferred or -1
	- MS C uses _dos_read()

	- see   read()  _open()  _creat()  _write()   _close()