status.i4.v = switch_set_flash_c(duration.i4.v)

	This routine will set the length of the flash of momentary and status
	switches when they are pressed.  If a switch has a callback function
	specified, the length of the flash duration could be extended if the
	length of time taken by the callback function is greater than this

	duration	length of flash in 15 Hz ticks

	This function returns ACNET status values as follows:

	OK			success
	CBS_INVARG		invalid flash duration

	This function requires the following include files:

	cbslib_h, acnet_errors_h

	Related functions:

	switch_create_c, switch_create_radio_c, switch_relabel_c,
	switch_change_case_c, switch_enable_c, switch_disable_c,

	C/C++ usage:

	int	status;
	int	duration = 3;

	status = switch_set_flash_c(duration);