Number of Points in each area - Enter the number of points to generate in each area feature.
Total number of points - Choose this option to specify the total count of random points. If multiple area features are selected, the points will be distributed randomly among the area features.
Points per unit area - Select this option to define the density of points, rather than a fixed number.
With Generate points in selected islands unchecked, points will not be generated in selected islands by default, check this option to generate random points both in selected area features and islands.
This setting will insure that all generate points will have at least this distance between all other points, on a per area basis. Specify the linear units of this setting in the drop list to the right. The dialog will validate this setting to insure that the specified number of points will fit within the selected area, and warn if this setting needs to be reduced.