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After enabling UFT to recognize the custom controls, you must provide support for running test object methods. If you try to run a test with steps that run custom test object methods before providing implementation for these methods, the test fails and a run-time error occurs.
Custom Servers contain the implementation for how UFT interacts with the custom controls. Custom Servers can be .DLL files or .XML files (which UFT converts to .DLL files "behind the scenes" when necessary). For instructions on deciding when it is appropriate to use each method, see Planning Your Support Set.
Most implementations are developed using DLL files. For more information, see Using a .NET DLL to Extend Support for a Custom Control.
Simpler implementations can be developed using the XML files, by creating a Control Definition file for each custom control. For more information, see Using XML Files to Extend Support for a Custom Control.
After creating the Custom Server, configure UFT to use it. For more information, see Configuring UFT to Use the Custom Server.