Hello Thomas,
When you build your SDK with MCUXpresso SDK builder you have the option to select your Toolchain/IDE. You can select GCC ARM Embedded or MCUXpresso IDE. MCUXpresso IDE is our newest IDE and it's the replacement of KDS.

I highly recommend you to use MCUXpresso IDE. In the User guide you will find all the information you need on how to work with the SDK.
Hope it helps!
Victor.
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