I've downloaded Lion. I have a boot disk. Can I use it to install on another machine?

I downloaded Lion from the Mac App store and it's working 100%. Love it.
After downloading and before installing, I copied the installESD.dmg (I think that's the correct filename) to a DVD (as per all the instructions out there to create a boot disc). I did NOT copy the entire "Install Lion App" to the DVD.
My question is: if a friend buys lion from the app and then cancels the download, can he use my boot disk to install lion as an upgrade? The reason I'm asking is that his Internet connection is rubbish and he can't download it. Presumably if I copy the dmg file to his hard disk I can run it that way?

Actually, you can burn a DVD or USB (8GB) thumb drive and let him boot and install from it. Or, you can actually run the InstallESD.dmg file from his machine. I've done both and Lion installs.
Personally, I would burn a DVD or thumb drive so you always have it.
Burn the InstallESD.dmg to a bootable DVD.
Launch Disk Utility and click the Burn button
Select the InstallESD.dmg file from your desktop as the image to burn. Insert a blank DVD and wait for the the image to be burned.
Burn the InstallESD.dmg to a bootable USB thumb drive.
Open Disk Utility and drag the InstallESD.dmg file to the left side pane. Go to the Partition tab ad select 1 Partition from the drop down menu. Choose Mac OS Extended (Journaled) on the left. Click the Options button under the partition table and choose GUID Partition Table. You will need this to make the drive bootable on a Mac. Hit the Apply button when ready to format the drive (it will erase everything on the drive).
Click on the Restore tab and drag the InstallESD.dmg file to the Source. Drag the USB partition to the Destination. Hit the Restore button and it will create the bootable USB drive with the OS X Lion installer

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I've downloaded Lion. I have a boot disk. Can I use it to install on another machine?

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