HP Support Packs have HP product numbers & are sold like accessories. The two versions of the same HP Support Pack are available. The HP Support Pack part number with a suffix of "A" represents the traditional shrink-wrap version; for example: H5479A. With this HP Support Pack, the customer receives a shrink-wrap HP Support Pack, & needs to register with HP to activate their service. The HP e-Support Pack part number with a suffix of "E" represents the electronic version; for example: H5479E. With the HP e-Support Pack, you can register by fax, or by the Internet. This warranty is applied to Vectra VL400 (CPU only), VL600 (CPU only), VLi 8 (CPU only).