True, but first let us clear something: there exist no functions that have no names. The extra trouble we get is that Windows have two ways to import a function, by name (which we have already seen) and by ordinal. Click on OLEDLG.DLL. You see that it imports a function that has no name but ordinal 8.
Open the OLEDLG.DLL in Hackman Debugger (should be in your windows system directory). You cannot debug it, but you can see its information header. Go to exported functions and voila! Ordinal 8 is equivalent to OleUIBuzyA!
We've seen now that there is no way that we can't find out ALL of the functions that a program is using.