Mastering Cross-Thread COM Communication: How the Global Interface Table Solves Interface Portability

In multithreaded Windows applications, COM interface pointers fail when passed between threads, causing crashes and deadlocks. The Global Interface Table (GIT) elegantly solves this by enabling thread-safe interface sharing through a simple cookie-based mechanism and transparent marshaling. Understanding GIT is essential for building reliable COM-based systems, especially as it increasingly underpins modern WinRT infrastructure.