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The "Main" tab of the RAP Launcher has an option to configure the "instance area" (a.k.a. "data location" or "workspace") for the launched platform. It does so by adding the -data switch. Since the workspace is only relevant for workbench applications, this setting seems to be too specific for a general RAP launcher. For most users it doesn't matter where the data location is created on disk. However, if the -data parameter is omitted, Equinox will chose $HOME/workspace as a default. This might be problematic because all launch configurations will share the same workspace. I'd suggest to remove the setting from the UI, and set the data location to a directory inside the configuration area. The configuration area can be customized on the "Settings" tab, it defaults to ${workspace_loc}/.metadata/.plugins/org.eclipse.pde.core/<LaunchConfigName>, i.e. it is unique to the launch configuration. By clearing the configuration area, one would also clear the workspace. If a custom directory is set using the -data switch on the arguments tab, this setting would have to be respected.
