BOINC-based projects compile program versions for common platforms (Windows/Intel, Linux/Intel, Mac OS/X. etc.), and place them on its servers. A participant downloads the core client for his platform (assuming that platform is supported by the project). When the core client requests work from the project's scheduling server, the client tells the server its platform, and the server instructs it to download the appropriate executables.

This addresses the needs of most BOINC participants, but it's inadequate if:

your computers have platforms not supported by the project;
for security reasons, you want to only run executables you have compiled yourself;
you want to optimize applications for particular architectures.

To handle these cases, BOINC lets you compile programs yourself rather than downloading them from the project. Here's how it works:

Download the source code for the BOINC core client and the project's applications, and compile them on your computer (instructions for compiling the core client are here). Or download executables from a server of your choosing.
Run the core client and attach to the project. This will create a 'project directory' (whose name is the project URL) in the BOINC directory. Exit the client.

Create a file app_info.xml in the project directory. This file lists the applications you have compiled or downloaded. It has the following form:

", htmlspecialchars("

    
        setiathome
    
    
        setiathome_2.18_windows_intelx86.exe
    
    
        setiathome
        218
        
            setiathome_2.18_windows_intelx86.exe
            
        
    

"), "

Run the core client again. When it requests work from the scheduling server, it will report its platform as 'anonymous', and provides a list of the applications it has. The server then sends whatever work is available for those applications.

This model is possible only with projects that make their application source code available.

You may want to check out the following email lists (e.g. the port may already exist):

boinc_opt@ssl.berkeley.edu: discussion of porting and optimization of BOINC applications.
boinc_dev@ssl.berkeley.edu: discussion of development and porting of BOINC software.

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