.v4p versus .vl
In vvvv a each patch has its own .v4p file. This is different with VL. Here many patches can be collected within a single .vl file or VL document, as we call it. Therefore small VL projects typically only have one VL document, even if they consist of multiple patches.
Then there are 3 different types of patches in vl:
The Document Patch
You can create a new Group patch by typing 'Group' in the Nodebrowser. Group patches are merely organisational elements in that hey have no purpose other than letting you structure/modularize your program.