How can I have both Windows XP Professional and Windows 7 on the same computer?

As I understand it, I can have both XP and Windows 7 on the same
computer dual booted so that I can choose between Windows XP or
Windows 7 at start up. How do I do this? Where can I obtain a copy of Windows XP
Professional? How do I install it?

Thank you.

Version: 6.1.7601 Service Pack 1 Build 7601
System Type: x64-based PC
OS: Name Microsoft Windows 7 Home Premium
System Model: Satellite L775
Processor Intel(R) Pentium(R) CPU B950
@ 2.10GHz, 2100 Mhz, 2 Core(s), 2 Logical Processor(s)


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