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What is COM?

Component Object Model (COM) is a binary interface software technology developed by Microsoft that enables objects to be used across programming languages, contexts, processes and machines without language-dependent adaptations or adaptations being required for their usage. COM is the foundation of other Microsoft domain specific component technologies like OLE Automation ActiveX DCOM etc.

COM relies on reference counting to support multiple uses of an object without creating memory leaks, and uses type libraries and interface definition files to separate implementation from interface design.

COM is the acronym for common mode input/output (CMIOP) serial port interface on a PC and refers to either a single serial port or emulated ports like USB 3.0 and Bluetooth. Alternatively, “common” stands for electrical switches with two terminals called C and L1 that connect directly to one wire or input source.

What is COM Interoperability?

Interoperability in IT parlance refers to the capacity for different software systems, devices or applications to connect and share data among themselves. It can also refer to data exchanged among these systems or applications.

COM is a binary specification, so it’s independent from programming languages. However, applications using COM must use an associated server to share logic and data between processes.

COM servers expose business functions as COM objects. A COM object is an abstracted collection of C functions and data structures that collectively form a business function, with wrappers attached that provide methods other applications can call. Furthermore, each server provides interoperability stubs so third-party apps may access these business functions directly.

What is COM Interoperability Objects?

Component Object Model (COM), developed by Microsoft, allows objects to communicate across programming languages, contexts and processes without language barriers or translation issues. COM serves as the basis of other domain-specific component technologies like OLE Automation, ActiveX and UMDF.

Each COM class implements one or more interfaces and has a unique identifier such as CLSID or ProgID for human-readable programmatic identification. They may exist either within an operating process, on separate threads, locally or network computers.

COM objects make their services available to clients via the COM Type Library, which outlines what services the object provides. When clients request access, COM servers instantiate and distribute references for specific classes that meet client specifications – this process is known as marshalling.

What is COM Interoperability Wrappers?

COM Interoperability Wrappers are used to overcome differences between.NET and COM environments. At runtime, these Wrappers are called upon to convert calls from managed code to invocation requests on unmanaged COM components that meet specific COM specifications. This is achieved via Runtime Callable Wrappers (RCWs), which make each component think it is communicating with another RCW instead.

An implementation of COM Interoperability Wrappers must typically be apartment-aware to ensure stable operations, which involves implementing ComputeVtables(), CreateObject() and ReleaseObjects() methods for efficient Native Object Wrapper disposal after each GC cycle. Furthermore, all these global methods pose significant constraints to design while impacting performance negatively.

What is COM Interoperability Server?

COM interoperability servers are software components that expose their functions to other applications, often known as COM object servers. They enable developers to build systems by assembling reusable software components from different vendors into systems with common interoperability specifications and communication conventions; typically these servers run on Windows platforms.

Contrary to software libraries, which must conform to specific language or linkage conventions for compilation and linkage purposes, COM-based components are designed specifically to work with any client application that supports COM. For instance, Visual C++ applications can communicate with MicroFocus COBOL object servers through platform invoke, providing access to unmanaged code implemented in DLLs via registration-free interoperability servers that also support event notifications and introspection operations.