Interactive general purpose computer algebra systems gain more and more relevancy in mathematics, education and engineering but also in related science. They are developed from monolithic systems to more open integrated working environments providing object programming languages, flexible and efficient concepts or software integration as well as parallel programming features. This book is addressed to users and developers of parallel algorithms in MuPAD. It describes Macro Parallelism in MuPAD which is based on the concepts of message passing, global variables and work groups and enables users to implement parallel algorithms for distributed computations in a heterogeneous computer network in a very easy way. This book includes the CD-ROM Macro Parallelism in MuPAD 1.4.1 with a hypertext version of this manual, trial versions of MuPAD 1.4.1 for Linux 2.0 and Solaris 2.5 as well as the net module which provides macro parallelism to MuPAD. The CD-ROM also contains the C/C++ Source code of the dynamic module net. Thus users can extend macro parallelism by any features desired or adapt it according to their need and can port it to other platforms and operating systems.