I think your interpretation might be right. Just looked at a Dell Vostro 1400 laptop keyboard in Google and didn't spot an @ sign on it.
With Alt + 64 you use the "numeric pad" on the keyboard (just in case you didn't realise it).
There's also the Windows Character Map:
You can make a shortcut to it using this target too:
Always pop back and let us know the outcome - thanks
message edited by Derek