I feel so silly just asking questions like a newbie >_>

Anyways, I was wondering how can I load stuff *emulators, applications, etc* from a dvd or usb? The sd card I am using is not mine, and the sd card reader is my brothers laptop. Since he's only here until sunday, I was wondering if there is a way to load files or applications from a usb or dvd without needed to access the sd card?