Waht is Progress API

API = Application Program Interface.
The use of within the Progress 4GL / OpenEdge ABL, is the ability to interface your Progress/OpenEdge instance with other applications. This is mainly, when used in a GUI environment, the interaction with other windows and/or 3rd party applications such as Microsoft Office.
Example exporting / interacting with Excel / Office / Access
 
@ Casper

Thanks ...

If i write a piece of API code.... How progress will read it??

Please let me the know what are the Prerequisites to implement API for

progress 9.1D and above ??
 
Just read the documentation. Many things are answered there.
If you have any third party application with some programming api, then you can make calls to it using Progress.
So you can incorporate third party applications by just using Progress, and that (most times) in a very straightforward way.

Casper.
 
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