Mobile code languages facilitate the transmission of code between remote sites in a system. A piece of code which is generated at one site can be transmitted for execution at another site which exhibits characteristics different from its place of origin. This poses implementation challenges for mobile code languages. For example, it becomes necessary for compiler writers to consider the heterogeneity of network nodes when generating code. By heterogeneity we mean that different nodes of a network may be of different architectures and therefore support different value representations.