previous_state.i4.v = abort_enable_c(abort_state.i4.v)

	This routine enables or disables the abort function.  The abort
	state must be enabled for use if it had been disabled previously.

	abort_state	(TRUE -> abort window (abort_check) will function,
			 FALSE -> user aborts will be ignored)

	This function returns status values as follows:

	TRUE			abort function was previously enabled
	FALSE			abort function was previously disabled

	This function requires the following include files:

	cnsparam_h, cbslib_h

	Related functions:

	abort_init, abort_check, abort_cancel, abort_cancel_all, abort_assert,

	C/C++ usage:

	int	previous_state;
	int	abort_state = TRUE;

	previous_state = abort_enable_c(abort_state);