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The "@@" name means anonymous label, you can have defined many of them in the source. Symbol "@b" (or equivalent "@r") references the nearest preceding anonymous label, symbol "@f" references the nearest following anonymous label.These special symbol are case-insensitive.
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call 后跟 @f ，表示 call 下一个@@符号处,@b表示call上一个@@符号处
例如:
call @f
db "advapi.dll", 0
//call 到这里
@@:
mov ebx,ebx
