include start_color
call OK init_pair 3 $COLOR_RED $COLOR_BLUE
include window_create
call OK mvwaddch $win1 5 2 `\000R`
call OK mvwchgat $win1 5 1 10 $UNDERSCORE 3 NULL
call OK wrefresh $win1
compare mvwchgat1.chk
call OK mvwaddch $win1 2 4 `\000T`
call OK mvwchgat $win1 2 4 2 $REVERSE 3 NULL
call OK wrefresh $win1
compare mvwchgat2.chk