Addresses and References, Absolute and Relative
Relative Addressing

The cell in column A, row 1 is addressed as A1. You can address a range of adjacent cells by first entering the coordinates of the upper left cell of the area, then a colon followed by the coordinates of the lower right cell. For example, the square formed by the first four cells in the upper left corner is addressed as A1:B2.
By addressing an area in this way, you are making a relative reference to A1:B2. Relative here means that the reference to this area will be adjusted automatically when you copy the formulas.
Absolute Addressing
Absolute references are the opposite of relative addressing. A dollar sign is placed before each letter and number in an absolute reference, for example, $A$1:$B$2.

OpenOffice.org can convert the current reference, in which the cursor is positioned in the input line, from relative to absolute and vice versa by pressing Shift +F4. If you start with a relative address such as A1, the first time you press this key combination, both row and column are set to absolute references ($A$1). The second time, only the row (A$1), and the third time, only the column ($A1). If you press the key combination once more, both column and row references are switched back to relative (A1)

OpenOffice.org Calc shows the references to a formula. If, for example you click the formula =SUM(A1:C5;D15:D24) in a cell, the two referenced areas in the sheet will be highlighted in color. For example, the formula component “A1:C5″ may be in blue and the cell range in question bordered in the same shade of blue. The next formula component “D15:D24″ can be marked in red in the same way.

And random Date Functions formula: =DATE(YEAR(A33), MONTH(A33)+1, DAY(A33))