The Mini SAP Basis System is the technical basis of all SAP server components and is designed to run on computers with minimal disk and memory resources. It gives you the opportunity to get to know the SAP Basis System, to try out Basis administration functions, CCMS, the Workflow, or to learn the ABAP programming language. MINISAP is a full-fledged Basis SAP system without the SAP applications (FI, CO, MM, SD, etc.). It has every Basis function of a standard SAP-R/3 system (ABAP/4 Development Workbench, Data Transfer Workbench, Computer Center Management System - CCMS, etc.) and, therefore, is a very good means to get exposed and trained in ABAP/4 programming language.
It is also a very good personal productivity tool (i.e., it can be used to develop programs for customers without having to be on-site).
The minisap are for those who are new and want to get Basis exposure or want to learn ABAP programming at their home PC.
For an overview of the Basis technology that is available, see the Extended Help function within the HELP menu.