FireMonkey Application Platform - Cross-Platform
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The FireMonkey application platform is inherently cross-platform and supports all the target platforms. Developing a FireMonkey application is generally different from developing a VCL application, and is described in the FireMonkey Application Platform section.
The steps you take in configuring the application to be cross-platform are the same steps for FireMonkey and for VCL applications. That is, you use the same steps in the IDE.