PDE provides several tools for launching plug-ins and features in your workspace. The Eclipse Application Launcher can be used to create a second running instance of Eclipse that runs the code you have in your workspace. This is commonly referred to as self-hosting. Self-hosting is a powerful debugging and testing tool. However it is sometimes necessary for code to be tested in your host, your currently running Eclipse instance. To test code in the host, you need to export and install into the running Eclipse instance.
To export plug-ins and features and install them into the host Eclipse do the following:
File > Export... > Plug-in Development > Deployable plug-ins and fragments
or
File > Export... > Plug-in Development > Deployable features

Eclipse Application Launcher
Export Wizards
Plug-in Export Wizard
Feature Export Wizard