Link an assembly or a list of assemblies to other objects.
Hierarchy
Assemblies can be linked to objects above or below, in the Gamgi hierarchy. 
Pressing the button 
Below (the default), the class menu 
shows the classes of objects that can be owned by assemblies. Pressing
the button 
Above, the same menu shows the classes of objects
that can own assemblies.
Gamgi expects users to identify first the assembly or list of assemblies
and then the object to link. When the 
Assembly entry is active 
and empty, clicking the mouse over an assembly, on the current layer
(local selection), its identification is transported to the 
Assembly 
entry. Pressing the 
List button, the current list of assemblies
is selected instead.
Gamgi is now expecting users to click on a object of the class 
currently selected in the class menu. This object can be in 
a different layer or window (global selection). 
To select a visible object, just press the mouse over the object,
in its window. To select objects without visual representation, such
as layers and lights, press the mouse over the graphic area in the window,
to create a menu with all the objects of that class in the window,
which can then be selected.
Method
Gamgi suppports only one method to link assemblies: 
Object.
The 
Object method links an assembly or a list of assemblies
to a single object, 
Above or 
Below.
When linking an assembly and the 
Hierarchy is 
Above, the assembly
is unlinked from its current parent and linked to the new object. When the
assembly is moved to a different layer, its bonds are automatically removed.
When the 
Hierarchy is 
Below, the child object is unlinked
from its current parent and linked to the assembly. An error
is issued when the parent already owned the child object.
When the new child previously owned the new parent (a situation made
possible because assemblies can own other assemblies), the new parent
is first linked to the new child parent. An error is issued when the
parent already owned the child object.
After the linking operation, Gamgi always puts on top
the window and layer containing the linked objects.
When linking a list of assemblies 
Above, all assemblies in the list
are unlinked and linked to the parent object. When linking a list
of assemblies 
Below, the child object is replicated as many times
as necessary to link each assembly in the list to a different replica.