Apple Numbers '08 - Manual (Page 53)

Chapter 3 Using Tables 53
To select an entire row or column:
1 Select any table cell so that the reference tabs are showing.
2 To select a column, click its reference tab (above the column).
To select a row, click its reference tab (to the left of the row).
Selecting Table Cell Borders
Select cell border segments when you want to format them. A single border segment is
one side of a cell. A long border segment includes all adjacent single border segments.
Here are ways to select border segments:
m To select border segments in a single step, select a table, row, column, or cell.
Click the Borders button in the Format Bar, and choose an option from the pop-up
menu.
A single (horizontal)
border segment
A long (vertical) border
segment
A long (horizontal)
border segment
A single (vertical) border
segment
Borders button