A range is a group of cells described by its top-left and bottom-right cell references.
Ranges should be entered in the form
A1:B3
The above example describes a group of cells two columns wide and three rows deep, with cell A1 as its top left and cell B3 as its bottom right.
Note that Fireworkz will accept ranges entered in the form A1B3. i.e. you need not use any characters to separate the two cell references which make up a range. The above example is given for users of other spreadsheets who are used to entering ranges using colon as a separator. All examples in this documentation also use the colon separator for clarity.