In System Preferences (or what do you have in Mavericks), first poster willing, please upload me the following few screenshots: 1- Standard US layout (current; no modifiers); yeah, this is an obvious one, strangely, I was not able to find a legit, readable version online. 2- US Extended layout, no modifiers 3+ US Extended layout with whatever modifiers give additional keys. The two default ones are Option and Shift+Option. But the guy in the Apple Store pressed an - unknown - modifier which produced difference in a 0 only on the very top left key (though on an ISO keyboard; I need ANSI). So, in minimum, I need 2 screenshots here, Option, Shift+Option, plus whatever else is out there. Please do one from a physical US Keyboard - ANSI, not an ISO. If you have ISO keyboard, you can do one as an extra for the common benefit - to see what is different. But I need the ANSI, first and foremost. Reason: I want to befriend with this layout first on Windows Truly appreciate you folks!