Sure. First, your application needs to be written or built in a way that it uses two or more threads of execution. You can use the Intel compiler's automatic parallelization, OpenMP or your own calls to Win32 thread routines.
Then you need to be running XP Professional on a dual-processor or dual-core system, such as one based on an Intel Pentium D or Intel Core Duo processor.
Building your app to use threads is a good idea even for use on single processor systems, especially if you have a GUI which you can keep in a separate thread from computation. This will make your app seem much more responsive to the user.
For more information, see the section on parallel processing in the Intel Fortran Building Applications manual.
