• You can activate any node on a GTS Tree except for datum or facet nodes.

• When you activate a node on the GTS Tree, all connections between the surfaces of the node and the surrounding geometry are temporarily suspended and are automatically restored, if possible, when the node is deactivated. This is different from detaching a surface. When you detach a surface, the two-sided edges become pairs of one-sided edges permanently, unless otherwise manually manipulated to create a connection node and restore the two-sided edges. This is very useful for modifying geometry of sub-nodes of merge operations.

• When you activate a surface subset of a component node, the connections between the activated surfaces and inactivate surfaces of the component are not removed. This allows the Repair tool to close gaps and repair tangency between and activated surfaces and the rest of the component. The Repair tool modifies the parameterization or boundaries or both of the only active surfaces. The Repair Tool may change neither the parameterization nor boundaries of surfaces that are not active, similar to the behavior of surfaces that had the Frozen with Boundaries constraint applied in the old IDD automatic repair tool available with Pro/ENGINEER 3.0 and earlier releases.

• When a node is active, you can reference any geometry in the model but cannot modify any geometry that is dependent. The geometry that defines the tree branch of a GTS Tree from the top-level node to the active node is called dependent geometry.

• If a node on the GTS Tree is active and you activate a different node, the currently active node is deactivated and its corresponding connections restored, and the new node is activated and its connections are removed.