This function returns a handle to the list of objects associated with
the current physical cell which constitute the group, as found by the
extraction system. These may or may not correspond to actual objects
in the cell. For example, the objects returned have been processed by
the Conductor Exclude directive, so would possibly be clipped
versions of the original objects. Additionally, objects from
wire-only subcells and vias that have been logically flattened during
extraction will be included. Objects from flattened via instances
will mave the MergeCreated (0x1) flag set, which can be
tested with GetObjectFlags. This allows the caller to filter
out redundant metal if standard vias are used, in addition to the
objects, to represent the net.
The argument is the group number. The returned objects are copies, so
can not be modified or selected. If an error occurs, 0 is returned.