tvblnkc (ul_tvcurses)

	tvblnkc(row.i4.v, column.i4.v, num_chars.i4.v)

	Draw blanks on the background window

	row		starting TV row
	column		starting TV column
	num_chars	number of blanks to be written

	This function requires the following include files:

	ul_tvcurses_h:tvcurses_h

	Related functions:

	tvmc, tvflshc, tvm_centerc, tvinit, tv_cleanup, tvfillc, tvhlinc,
	tvvlinc, tvboxc, tvceolc, tvceopc, tvclrc, rdcursc, tvscrsc, tvrfmtc,
	tvsetcolorc

	C usage:

	int	row = 1;
	int	column = 1;
	int	num_chars = NUM_CHARS;

	tvblnkc(row,column,num_chars);