John questions

• Is the stack aligned to a 4 bytes boundary when my program starts?
• How to get a file size even if it is already open for exclusive access?
• Can an x86 CPU read the value of any register while in user mode?
• How to get the same MAC address?
• Why the operands of an operator needs to be of the same type?
• Can I write multiple Assembly instructions on the same line?
• Is HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Cryptography\MachineGuid unique?
• Where are the stacks for the other threads located in a process virtual address space?

John answers