Scilab as a (D)COM server
Since version 2.50 (released March 1, 2007) the R(D)COM server also allows to use Scilab as a COM client.
Just install the (D)COM server, copy one file to scilab/bin (this is explained in the docs) and have a look at the Excel example which can be downloaded from the download page
Some machines have problems with Scilab and the DCOM server. In such a case, you have to install and update (from Microsoft) for the C++ redistributable files (from Visual Studion 2008 SP1). Be careful to download the correct files. Microsoft has a few updates, all with the same name. With the wrong one, things still will not work.