Methods for node impedance calculation
                                        You can have node impedances calculated automatically prior to, during, or after the assignment (Fundamentals: Setting parameters for PrT assignments).
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                                                         Note: For nodes with Node VDF or Turn VDF being selected for Method for impedances at node the impedances will immediately be updated as soon as you edit a relevant input attribute.  | 
                                                
Independently of assignments, you may manually calculate node impedances. Set selected nodes to the active state, if applicable, and chose the appropriate method.
- Operation Update impedances at node in the procedure sequence (Updating the impedances at all nodes and main nodes)
 - Update impedances (shortcut menu Nodes) in the network editor (Updating impedances at nodes)
 - Script (via COM interface) (Integrating script files or script code into the procedure sequence)
 - For multiple nodes by editing t0 via Edit nodes or Multi-edit nodes in the Formula tab
 - For a single node
 - by editing t0 in the node list or in the junction editor or
 - via the 
 Perform ICA calculation icon in the junction editor (Calculating and exporting ICA) 

