Unlike traditional programs designed for repeated, long-term use, OneShot freeware refers to tiny, portable utilities built to perform a single, specific task—and perform it immediately. The name captures the ethos perfectly: you launch it, it does its job (often in a flash), and you close it. No installation wizard, no background processes, no lingering registry entries.
The freeware version was significantly shorter and more experimental than later editions: oneshot freeware