MS4W is an installer for setting up MapServer on Microsoft Windows platforms. The purpose of that package is to allow all levels of MapServer users to quickly install a working environment for MapServer development on Windows. It is also an environment for packaging and distributing MapServer applications.
The basic MS4W package installs a preconfigured Web Server environment that includes the following components: Apache HTTP Server, PHP, MapServer CGI, MapScript (CSharp, Java, PHP, Python), GDAL/OGR Utilities, MapServer Utilities, PROJ Utilities, Shapelib Utilities, Shp2tile Utility, OGR/PHP Extension, OWTChart.
The default limit of that Windows-compilation are 64 symbols and 200 layers.