status.i4.v = window_is_frozen_c(window_id.i2.v)

	This routine returns whether or not the indicated window has
	been frozen by an earlier call to window_freeze_c.

	window_id	ID of desired window

	This function returns status values as follows:

	CBS_INVARG		invalid window ID was specified
	CBS_NO_WINDOW		window doesn't exist
	TRUE			window is frozen
	FALSE			window is not frozen

	This function requires the following include files:

	cnsparam_h, cbslib_h, acnet_errors_h

	Related functions:

	window_freeze_c, window_unfreeze_c

	C/C++ usage:

	short	window_id;
	int	status;

	status = window_is_frozen_c(window_id);