once you asked why somebody is using
virtual at something
name dd 0
end virtual
when he can use
name = dword something

but code like this:

org 256
name = dword 400
mov [name],100

throws error, "dword" is ignored. It doesnt nor mean
mov [dword name],100
as i first awaited.
Could you explain it please?[/code]

No, I meant you can use "label name dword at something", the construction you have used does something completely different, as in this case "dword" operator applies to the size of number itself, not to the size of data that is labelled by this symbol (for example "name=dword not 0" will give you constant 0FFFFFFFFh, while "name=byte not 0" will give 0FFh).