One of the main advantages of E3L is that it provides society with technology that enables the exchange of data between source and destination platforms and, more importantly, does not require human intervention. This is achieved by what we call Web Services which, through the use of technology market standards, become the gateway to different public platforms, enabling the receipt and provision of information. Web Services are available 24 hours a day, 7 days a week. The advantages of this technology are evident, and it is the future scenario desired by all of the parties. Although Web Services are developed according to rules known to everyone, their flexibility does not ensure that the gateways in question have been developed in such a way that they can be opened with the same ‘key’. This means that the same service (the submission of a document to a public authority, for example) has to be invoked in different ways if the means of ‘opening’ the gateway has not been agreed by those providing the service. Environmental Electronic Exchange Services (E3S) is a catalogue of Web Services offered by the ETER Community, and it requires that all of the Web Services provided by the different public authorities participating in ETER are designed according to these standards. To use technological terminology, Web Services Description Languages (WSDLs) explain how to develop Web Services and how these can be invoked by the clients of the service. The benefits are immediate; private entities no longer have to worry about the format of the data they submit to the different public authorities because E3S allows them to invoke the Web Services (open the gateway) in the same way, regardless of the public authority providing the service. Download the Reference Manuals and the files needed for the implantation of E3S, including the schedules may find E3L (environmental data dictionary) in the localized version, the outlines E3S (data dictionary specific services offered) and finally the Specification's WSDL (Web Services Description Language). Additionally you can download a document that identifies changes between versions and releases E3S, and that will help you identify the relevant differences for integration into their platform of the new release.