This page allows you to select the target machine to run your applications. Your choice is limited to machines reported in the allpication.xml file as capable to run.
If the code can be installed by the user, you can choose the platform to install it.
Once the machine is selected, the machine name is added to the application context, and user will be given further guidance how to submit the application. At this early stage, the code object is not saved, that is, it will be lost once the session is completed.