Selects all materials. These can then be edited simultaneously in the Attribute Manager.
Deselects all materials.
Use this command to select the materials used by the selected objects or Material tags. The Material Manager will scroll if necessary in order to display these materials.
Shows the first selected material in the Material Manager.
Selects all Material tags that use the selected materials.
When an material is selected, this command can be used to select all other matierals with the same Reflectance channel structure. These can then be edited simultaneously. More information about this feature can be found under Multiple Selection in the Reflectance Channel