Page History
...
In VLF-WIN instance commands are displayed when you right-click an instance in the Instance List.
Whether a command is best implemented as applicable to the business object itself or its instances depends on the context.
...
An instance command handler can be written in such a way that it processes several instances at once. To see how this works see the Programming Techniques application -> Basic -> Selected, Current or All Entries.
This property is in the Commands Allowed tab.