1. A computer-based method of retrieving Web document information from a computer network, comprising: retrieving a Web document from a computer network using a first protocol included in a primary document address specification; obtaining data from the Web document; determining whether the primary document address specification has a corresponding secondary document address specification; and if the primary document address specification has a corresponding secondary document address specification, retrieving supplementary data from the computer network pertaining to the Web document using a second protocol included in the secondary document address specification.