You can have multiple versions of the QNX SDP installed on your host computer. In most cases, the IDE installed with the new version should work with the toolchains from earlier releases.
When you install the QNX SDP, you receive a set of configuration files that indicate where you've installed the software. The QNX_CONFIGURATION environment variable stores the location of the configuration files for the installed versions of QNX Neutrino. By default, the IDE uses the last installed version of QNX software that appears in the Select SDK list on the Global QNX Preferences page (select , then select QNX).
On Windows hosts, run-qde sets up the development environment before starting the IDE.
The qconfig utility lets you configure your computer to use a specific version of QNX Neutrino:
For more information about coexistence, see Coexistence in the Migrating from Earlier Releases chapter.