Autodesk AUTOCAD 2006 Command Reference Manual page 105

Rectangular Array
Creates an array of rows and columns of copies of the selected object.
1
object selected
Rows
Specifies the number of rows in the array.
If you specify one row, you must specify more than one column. If you specify
a large number of rows and columns for the array, it might take a while to
create the copies. By default, the maximum number of array elements that
you can generate in one command is 100,000. The limit is set by the
MAXARRAY setting in the registry. To reset the limit to 200,000, for example,
enter (setenv "MaxArray" "200000") at the Command prompt.
distance between
rows
distance between columns
Array Dialog Box | 81