This paper discusses modalities of meaningful use of multimedia sources in Computer Supported Collaborative Learning (CSCL) theory and the design of CSCL software tools. A discussion about main similarities and differences between the concepts of networking, coordination, cooperation, and collaboration is presented at the beginning. These concepts are compared with Knowledge Building. After presenting CSCL concepts and tools, the paper focuses on the use on video tools on computers and handhelds, ideas and practices that take place in today's CSCL video researches. In the final, an evaluation about the contribution of handhelds in CSCL and KB educational practices is discussed.