The mouse pointer manipulating code [closed]

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You have it rather the wrong way around. There is no direct hardware link between the mouse hardware and the mouse pointer – there must already software rendering the pointer in response to the mouse motion. If you wanted the pointer to behave differently that would simply be different software rather than another software layer.

The language the software is written in is largely irrelevant, but system level code is most often written in a system level language. In the era you are discussing that would generally be assembly code/machine code. Any useful high level language of the time would have means to invoke machine code sub-routines to support extensibility.

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