SAP and Informatica PowerCenter (IPC for short) base their functionality on internal tables which forms the model for proper working. In this book we will discover the functionality of this tables so that we could use the information extracted in our purposes. Aim of this book is to open the horizons of "internal programming" when it's obvious that some information from user interface program is to be shared. This information can be useful in such operations like monitoring and, in common sense, model construction. Both SAP and IPC provide this information with use of internal table scheme on which it builds its internal structures. Our purpose is to decompose the usage of each table and interaction process as the whole.