The Attribute Browser displays attributes.

You use the Attribute Browser to insert an attribute into an expression; into for example a Process Modifier's expression or a Data Node expression. See Working with Expressions for more information.
Attributes are in a tree structure, where attributes can be underneath other attributes. In the 'Data' area you select Feature, Tool, Job or User, and you see the tree underneath this..
Underneath the Feature attribute are the Hole and Mill attributes.
Note that in certain cases you can use user attributes to specify a range of values, see Setting User Attributes as Ranges.
See also: