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What is a GIS?
A Geographic Information System, or GIS, is an organized collection of computer hardware, software, geographic data, and personnel designed to efficiently capture, store, update, manipulate, analyze, and display all forms of geographically referenced information. Or, in simple terms:

A computer system capable of holding and using data describing places on the earth's surface in a better analytical manner.

Questions a GIS can answer

• Location: What is at a given location?
• Condition: Where does something occur?
• Trends: What has changed since ...?
• Patterns: What spatial patterns exist?
• Modeling: What if ...?

Interlinking ILWIS and Visual Basic

A. ILWIS as DDE Server
IlWIS can act as a DDE ( Dynamic Data Exchange ) Server . This implies that ILWIS can receive input from other DDE supporting packages like Visual Basic or Delphi based systems. In this package we have created a user-friendly GUI (Graphical User Interface) which run the command required to obtain a certain result by performing certain operations on ILWIS. The user need not type in all the commands or perform other operations on ILWIS, all this is done automatically by the interface. The user is required to enter the file to be operated upon and the desired parameter to be obtained.

Example: