The term "Portable" in the context of Warcraft III typically refers to community-made versions designed to run from a USB drive without a formal installation. Warcraft 3: Frozen Throne Review - Gaming Nexus
To get the most out of your portable Warcraft III setup, consider these tips: warcraft+3+frozen+throne+portable
Portable versions do not write permanent files to the host computer's registry, keeping the guest system clean. The term "Portable" in the context of Warcraft