Windows 7 and Ubuntu 12.04 Installer Bootable USB

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http://askubuntu.com – I would like to know whether it is possible to have Windows 7 installer files and Ubuntu 12.04 installer files on the same bootable USB drive so that if I choose to boot a PC with such a USB drive, I will get the option to install either Windows 7 or Ubuntu 12.04 on it. Perhaps a USB drive can have two bootable partitions, one with Windows 7 setup files while the other can have Ubuntu 12.04's setup files. On booting with such a drive, one gets a boot screen which lets you install either of the two or both at different times. Is such an arrangement possible? Can this be done? Please let me k (HowTos)