Applications with cloud-extensions Some desktop applications have optional extensions into the cloud, for example Mathematica and MatLab. The latest versions of the mathematics software packages MatLab and Mathematica provide an extension for compute-intensive tasks. They are capable of using Cloud Computing to perform expensive evaluations. To use this, one or more Amazon EC2 images have to be configured. Mat- Lab offers two different work modes batch and interactive. In batch workflow, a MatLab user can submit a job to the cluster scheduler, possibly shut down MatLab, and retrieve results later once the job has been executed. In an interactive workflow, a Mat- Lab user is connected directly with the MatLab workers running in the cluster. The user sends commands that are executed immediately, and the results are available as soon as the command execution is complete. Response times may be slow depending on traffic and amount of data exchanged.