A key feature of the PC-21 is the embedded simulation and training suite, which provides cross-platform cockpit emulation, weapons simulation, stores management system, simulated radar and electronic warfare, a tactical situation display, and data link functionality. Key to this is the Mission Support System (MSS), which comprises the Mission Planning System (MPS) and Mission Debriefing System (MBS); data can be loaded and unloaded from these, which is compatible with ground-based stations for pre-flight configuration or post-mission analysis. The integrated mission computer is of an open architecture, allowing for third-party modifications and upgrades to take place; software can also be customized to conform to customer preferences. Critical and non-critical software are also deliberately separated.