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Portable Virtualbox is the portable version of Oracle Virtualbox software. It works similar to VM-ware, but it is completely free. You can run virtually any OS on this Pendrive without using additional software installation or booting from the Pendrive. After installing the Kali Linux in the newly installed v-box, you can use kali via the live image from kali.org to configure it as you do on the normal v.box. Then after everything is done, you. can access the OS from the. Pendrive.