The variety of data sources has created a wide range of mechanisms to access them. Local data sources are different in application programming interface (API), and network sources, in their turn, in transport and protocol interaction level. In general, this has led to the fact that the addition of support for a new data source requires the creation of interface module or driver. Taking in account the great variety of sources, it is extremely expensive and actually impossible to cover the entire spectrum of the market of these devices. The situation is somewhat simplified with the network source due to the presence of the number of standard and free interaction protocols, but many sources still use their own protocols: private, commercial or protocols, tied to private mechanisms of the commercial operating systems (OS).