In the field of observational astrophysics, the remoteness of the facilities and the ever increasing data volumes and
detectors poses new technological challenges. As an example, the VISTA and VST wide field telescopes, which are
being constructed at the ESO's Cerro Paranal Observatory and will be ready in the next few years, have cameras which
will produce after just one year of operation a volume of data that will exceed all the data collected by the VLT since the
start of operations in 1999. This sets serious limitations if such large quantities of data must be transferred and accessed
in a short time by the participating European Institutions.
The EVALSO project, approved by the European Community, addresses these targets in two major ways. It will create a
physical infrastructure to efficiently connect these facilities to Europe. This infrastructure will be complementary to the
international infrastructure already created in the last years with the EC support (RedCLARA, ALICE, GEANT).
Besides this, it will provide the astronomers with Virtual Presence (VP), i.e. the tools to perform and control an
astronomical observation from the user's site.
The main role of INAF - Astronomical Observatory of Trieste (OAT) within the project will be the definition of the
architecture, the development of VP system and the integration of a prototype to be used as a demonstrator.
This paper will focus on the description of the Virtual Presence system.