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帮助文件中有的。
When you use a register in an expression, you should add an at sign ( @ ) before the register. This at sign tells the debugger that the following text is the name of a register.
If you are using MASM expression syntax, you can omit the at sign for certain very common registers. On x86-based systems, you can omit the at sign for the eax, ebx, ecx, edx, esi, edi, ebp, eip, and efl registers. However, if you specify a less common register without an at sign, the debugger first tries to interpret the text as a hexadecimal number. If the text contains non-hexadecimal characters, the debugger next interprets the text as a symbol. Finally, if the debugger does not find a symbol match, the debugger interprets the number as a register.
If you are using C++ expression syntax, the at sign is always required.
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