One PC - Two installations of Win7. Possible?

In my searching so far, I've gotten inconclusive answers to this question. It seems to depend on the person's views on how the MS Licensing works, or to what degree they feel bending the rules is "okay." All I want to know is what the real answer is to the letter of the law.

I have a PC I am replacing the primary HD with a SSD. The user wants me to load Win7 on the SSD and make that the primary boot and workspace. He uses a crappy application that doesn't play well with anything else, so he's asked me to use the old HD and load Win7 on that as well. Same license key. That way he can run that app on a "clean" install of Win7 without anything else getting in the way.

Technical:
What's the simplest/best way to load and boot to Win7 on two drives on the same PC?

Legal:
Can I use the same key to install Win7 on both drives of the same PC? I don't think you can without buying a second license. But confirmation appreciated.
Eric JackIT ManagerAsked:
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KimputerCommented:
Technical, Windows takes care of the dual boot options when you install it. You get the option to overwrite Windows or start new (then of course, don't choose the same disk, choose the other one!). After finishing your installation, it will show 2 lines during booting. One is for the normal hard disk, one is for the SSD.

Legal: Find the license.rtf file (it's on the computer after install, or already on the install media. how more official do you want it?). There is the real answer. It will probably have a header saying "How can I use the software" and between those lines it will say "the right to install and run one copy on the computer"
If you have it on a normal hard disk, and install it again on the SSD, it's clearly TWO COPIES.
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Dennis JohnsonIT technicianCommented:
...or give a call to a Microsoft representative and ask them the same question.
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Eric JackIT ManagerAuthor Commented:
Well, as Kimputer said, it's on the license file. I normally have a hard time understanding the EULAs as the legaleze on them makes my head spin. I did find the particular paragraph that says one copy on one computer. So that answers that. Without the ability to install it twice, and not wanting to spend the money on the extra license, the first part of my question has become null.

...now if I can figure out why the damn SSD won't boot up after installing Win7 on it.
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KimputerCommented:
Have the SSD be the only hard drive in the PC. After successful install from USB or DVD, make sure the BIOS points to the SSD as the first boot device.
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Eric JackIT ManagerAuthor Commented:
It boots off the ssd. After the windows splash screen, the monitor goes dark. It appears to be an issue with the video drivers. Seems to be a known issue with some dells.
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