Explanation of the InfoObjects tree:

The InfoAreas are under the root
@6G@ InfoArea.

Further InfoAreas or the InfoObject catalogs are under an InfoArea.
@88@ InfoObject catalog.

The InfoObjects of this catalog can be found under an InfoObjectcatalog.
@81@ InfoObject is an active characteristic.
@82@ InfoObject is an inactive characteristic.
@83@ InfoObject is an active key figure
@84@ InfoObject is an inactive key figure
@85@ InfoObject is an active unit
@86@ InfoObject is an inactive unit
@1T@ InfoObject is an active time characteristic
@9R@ InfoObject is an inactive time characteristic
@6O@ InfoObject in general

The hierarchies that that belong to an InfoObject can be found
underneath it.
@6Z@ Active hierarchy.
@70@ Inactive hierarchy.

Meaning of the buttons in the columns by the node name:

On the InfoArea level:
No buttons exist on the InfoArea level.

On the InfoObject catalog level:
@3C@ InfoObject catalog is active.
@81@ InfoObject catalog contains characteristics
@83@ InfoObject catalog contains key figures
@85@ InfoObject is an active unit
@1T@ InfoObject is an active time characteristic

On the InfoObjects level:
@81@ InfoObject is an active characteristic.
@82@ InfoObject is an inactive characteristic.
@83@ InfoObject is an active key figure
@84@ InfoObject is an inactive key figure
@85@ InfoObject is an active unit
@86@ InfoObject is an inactive unit
@1T@ InfoObject is an active time characteristic
@9R@ InfoObject is an inactive time characteristic

On the hierarchies level:
@0K@ Hierarchies is noted for activation.

General:
@5Y@ Object was delivered by SAP.