This paper describes the implementation and use of a platform designed
to support collaborative multimedia applications in a mobile environm
ent. The platform provides a programming interface compatible with eme
rging open systems standards, and includes services for processing mul
timedia information. In addition, the platform provides feedback to ap
plications and users on the state of their communications infrastructu
re - an important requirement in mobile environments. The services pro
vided by the platform have been used to develop a collaborative multim
edia application designed to support a specific class of mobile worker
, i.e. held engineers. The design decisions taken in our implementatio
n of both platform and application are evaluated, and our experiences
are presented.