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+Good Core:
+
+Completely separated from UI.
+Minimal MSVCisms or GCCisms in code.
+No OS-specific code.
+All file IO access can be abstracted away to streams or byte arrays.
+Optical disk access, if applicable, through GetToc() and GetSector() type primitives.
+Multi-instance capable.
+Multi-threading, if applicable, is handled internally.  The frontend will call FrameAdvance()
+  on a single thread and callbacks will be marshalled back to that thread.
+
+Bad Core:
+
+Core intertwined with UI and movie recording systems.
+Compiles only with oddball/crappilers.
+OS-specific system calls everywhere.
+Direct file IO that can't be trapped or rerouted easily.
+Optical disk access through cruddy cuebin system that can't be replaced easily.
+Single instance.
+Sloppy multithreading, or main program loop that can't be easily factored out.