A very simple clarion solution that creates a console application which takes a parameter on the command line, calls the Clarion Evaluate function and returns the result to stdout.
Example from the command prompt
c:\Dev\ClaEvaluate.exe "'test'" >test c:\Dev\ClaEvaluate.exe "Format(Today(), @D06)" >24/10/2013
C# .NET Example
Also included is an example of using this from a .NET program too.