Anyway where can i find other methods and properties of excel application and other applications eventually??
Progress has a COM object viewer (%DLC%\bin\proobjvw.exe). Run that and then open the COM library (in this case, excel.exe). It will show you the OE view of the objects, properties, methods, and events. This is useful because OE and Excel don't always agree on signatures, e.g. which parameters are mandatory or optional.
Other applications may implement things differently. For example, the Word library is in a separate file (can't remember the name offhand), not in winword.exe.
There is also an Excel object model reference guide in the Excel documentation, both in the product and
online.
Also, get to know the VBE (Visual Basic Editor) in Excel (alt-F11). One good way to learn how to automate things in Excel is to use the macro recorder. Start recording a macro in Excel, then open the editor and find the macro you're recording. As you make changes in your workbook, you'll see the VBA code showing up in the editor in real time. You'll then be able to translate that code from VBA syntax to OE syntax. Mostly, the differences are colons instead of periods as separators, and the way that some parameters are passed.