NodeDiff Node1=MyBus.n Node2=SameOrAnotherBus.m

This command will take the difference in the voltages between any two nodes and write it mag/angle style to the Result window (i.e., the Text.Result interface if you are using COM).

Show DeltaV

This command creates a report of the voltages across each 2terminal device (such as Line and Transformer objects) phasebyphase. Useful for line voltage drop reports.