NAME
	SelectInput -- Select a filehandle as the default input channel (V36)

   SYNOPSIS
	old_fh = SelectInput(fh)
	D0                   D1

	 BPTR SelectInput( BPTR)

   FUNCTION
	Set the current input as the default input for the process.
	This changes the value returned by  Input().  old_fh should
	be closed or saved as needed.

   INPUTS
	fh     - Newly default input handle

   RESULT
	old_fh - Previous default input filehandle

   SEE ALSO
	 Input(),  SelectOutput(),  Output()