To install Frenzy on USB Flash use the install2flash utility.
USB Flash must be at least 256 MB.
Flash is devided on two different partitions: UFS partition 200-250 MB of size (for Frenzy) and FAT32 partition on the space left (for data storage). The boot loader is installed on Flash disk (FreeBSD loader), wich alows then to format FAT partition as system one and start, for example, FreeDOS from it.