WinASEAN 4.0 - Windows based Advanced System for Environment ANalysis with remote sensing data version 4.0 is the follow up product of WinASEAN 3.0 which was developed by the Department of Environmental Information Study and Analysis (EISA) and has been used for hands-on-training in the framework of the annual Regional seminar on Earth observation for tropical ecosystem management organized jointly by NASDA and UN ESCAP since 1993 to 2000. The WinASEAN runs on most of the latest MS window platforms like Windows 2000 and Windows XP. The WinASEAN 4.0 features new functions such as modeler: advanced inter channel and inter image analysis function using interactive input of computing model written in FORTRAN programming languag, Hyperspectral image visualization: new false color composite technique for image with more than 3 spectral channels, Image mosaicking: easy-to-use function for mosaicking geo-referenced images, virtual reality display: combination of image and DEM data to create virtual reality images. The WinASEAN 4.0 can handle 2 byte data processed by computers with different CPU systems and can be used for both practical usage and educational purpose.