How do I find out the difference between ‘High’ and ‘Standard’ when selection protection level, and likewise - the difference between the levels when scanning the local disks?
Unfortunately I haven’t found anything about it yet.
Looking forward to hear from you 
For most modules there is no big difference between Normal and High,but there is a big one for Standard Shield. On Normal level it scans only opened files (the one you click on),on High it scans files that are scanned when created/modified and when they are opened. I recommend High setting for optimal protection.
For On-Acees scans (manual):
Quick Scan (scans only infectable files,virus targeting is probably on → exe,pif,com,scr and so on)
Standard (Scans all files,virus targeting is probably off)
Thorough (All files,scans entire file not just header,virus targeting off)
maybe you can refer to this thread to further customise your standard shield… 
http://forum.avast.com/index.php?board=2;action=display;threadid=3202;start=0
If I’m not mistaken, in a Standard scan what you call virus targeting is broadened so that all files are at least briefly checked to determine what file type they really are, regardless of extension. And if they’re actually excecutable/infectable despite (probably false) file extensions, then they get the full scanning treatment.
Oki - thanx …