We do not have any special support for the Uniface language. However, our tool can test any application in black-box mode. Here is a quote from the "Supported Development Tools" help topic of TestComplete's Help system:
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TestComplete does not depend on any development tool. It can simulate user actions (keypresses, mouse movements and clicks) under any Windows application no matter whether this application was created in C#, Visual C++, Delphi or Java.
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As you can see, TestComplete was not designed for a specific product or development tool. Therefore, it depends on the kind of testing you are going to perform whether our product meets your needs or not. I recommend that you try recording a simple test and check whether the tool meets your expectations.