Thanks to a large fleet of heliospheric missions, a new golden era for heliophysics is upon us. Joint observations between different space and ground-based observatories can maximize the scientific return of remote-sensing and in-situ investigations of the solar corona and heliospheric plasmas. This session focuses on studies exploiting multi-spacecraft observations of specific solar/heliospheric phenomena. Instances are (i) radial alignments between two or more satellites for in-situ investigation of the evolution of CMEs or solar wind turbulence, (ii) Parker Solar Probe - Solar Orbiter quadratures for simultaneous local and remote observations of the same plasma, (iii) coordinated remote-sensing observations from ground and space for a 3D reconstruction of the heliosphere. Due to its multidisciplinary nature, this session deals with a wide range of phenomena occurring on the Sun and their interactions with the surrounding environment, starting from the photosphere, through the corona, out to Earth orbit and beyond.