The EXPRESSION toolkit is available as downloadable source code which needs to be compiled on a host machine before it can be executed. To run EXPRESSION, you will require a machine running Windows and Visual C++ installed on it. The EXPRESSION toolkit has been tested on the following systems:

OS: Microsoft Windows XP Professional, Windows 2000 Server
System Type: X86-based PC
Processor: x86 Family 15 Model 1 Stepping 2 Genuine Intel ~1 Ghz
Total Physical Memory: 512.00 MB
Total Virtual Memory: 1.72 GB
Page File Space: 1.22 GB

Development Platform: Visual C++ 6.0 Enterprise Edition

Additionally, you will also require access to a SUN Sparc workstation if you plan to compile your own C applications (see manual for details). This step can also be performed online, by clicking here to go to the web based compilation  page where you can upload your C program and get the requisite .defs and .procs files needed by the EXPRESSION toolkit after compilation.