BOARD displays the result of a specific board including matchpoints if the section was scored. It can be used to make score corrections.
If you see a mistake while VIEWing the boards, you can use BOARD to correct it. ACBLscore will ask you the board number. Entering the board number will take you to a screen which, at the top, gives the section letter, board number, vulnerability, and top. Below this line, there are four columns: N-S pair number, score (from N-S perspective), E-W pair number, and the matchpoints earned by N-S.
At the bottom of the screen, enter the N-S pair number whose score is wrong. Then, you will be asked the score of the pair; enter the score. Next, there will be "N-S pair [ ]" prompt at the bottom of the screen again, to let you change the scores of any other pair on the same board. If the rest of the scores are right, press ESC. This time there will be "Board # [ ]" prompt which allows you to check other boards. Press ESC or zero to quit.