TC: int _write( int handle, char *buf, int count )

	- prototype in io.h

	- writes "count" bytes from "buf" to file or device at "handle"
	- count cannot be greater that 65534
	- is a direct call to MS-DOS write function INT 21,40
	- does NO conversion of CR/LFs; all output is binary
	- returns a count of bytes written  or -1 on error
	- MS C uses _dos_write()

	- see  write()  _open()  _creat()  _read()