GAP TUTORIAL. PART 1 ==================== John McDermott GAP is a system for computational discrete algebra, with particular emphasis on Computational Group Theory. GAP provides a programming language, a library of thousands of functions implementing algebraic algorithms written in the GAP language as well as large data libraries of algebraic objects. GAP is used in research and teaching for studying groups and their representations, rings, vector spaces, algebras, combinatorial structures, and more. The system, including source, is distributed freely. You can study and easily modify or extend it for your special use. The current release is GAP 4.4.10. In these lectures we will cover some of the basics of using the GAP system. There will be a brief discussion of the structure of the system, including hints on how to get help and learn more. We will look at programming in GAP and consider how the system can be extended to meet the needs of the user. In particular, GAP packages will be discussed. There will be worked examples throughout and some exercises for participants to try during the afternoon sessions. GAP TUTORIAL. PART 2 ==================== Alexander Konovalov In this final lecture about the GAP system I will introduce the development version of the GAP package SCSCP (http://www.cs.st-andrews.ac.uk/~alexk/scscp.htm) which is an implementation of the Symbolic Computation Software Composibility Protocol (SCSCP) (http://www.symbolic-computation.org/scscp/) for the GAP system. By means of SCSCP a computer algebra system may offer services which may be accessed by a number of clients, including: * A Web server which passes on the same services as Web services using SOAP/HTTP protocols to a variety of possible clients; * Grid middleware; * Another instance of the same CAS (in a parallel computing context); * Another CAS running on the same computer system or remotely. In my talk I will demonstrate examples of accessing SCSCP-compliant versions of GAP and KANT systems using the SCSCP client for GAP, and will give a tutorial how to design and provide SCSCP services using the GAP system.