Current solutions to support co-authoring of documents focus on building new systems for participants who are assumed to be connected permanently by a network. We propose an alternate approach, that copes with heterogeneous editing systems and increasing usage of mobile/handheld devices. Each person is allowed to use its favorite editor for isolated as well as for cooperative work. This is achieved by using a global standardized document format and a suited platform. By choosing a wide spread platform, the flexibility to constitute arbitrary teams in spontaneous manner is increased. To treat the mobility problem, participants have representatives in a static part of the network. A prototypical implementation is presented connecting Emacs with LaTex mode to a distributed document environment based on SGML and CORBA.