Accessing the top level menu bar?

[Tomkat]

I love keyboard shortcuts, as I hate wasting time moving my mouse around.

For example, once I use my mouse to drop down the "Vertex" menu... I can use the "V" key to "Snap Objects by Vertices"

But, HOW do I access the top level menu bar via keyboard shortcut?
Usually it's ALT, then some key (indicated by underlined letter), but I've tried a bunch of different stuff without success.