Specifying row and column values
In the lower area of the Actions tab, specify the row and column locations of the corners of the marking rectangle that you want to create or edit. Or, if the Box selection action is the currently selected action in the Actions listbox, you can click and drag the mouse over the session window to create the marking rectangle that you want to create. When you have completed the marking rectangle on the session window, the Macro Editor writes the row and column value of the corners of the marking rectangle into the appropriate Row and Column input fields of the Box selection action.
You can type a negative number (such as -1) into the Row (Bottom Corner) input field and into the Column (Bottom Corner) input field to specify a relative offset from the last row and last column of the session window. For example, if the session window is 24 by 80 and you specify corners of (1, 1) and (-4, -10), then the macro runtime draws a marking rectangle with the coordinates (1, 1) and (21, 71) (see Significance of a negative value for a row or column).