Windows Admin-Elevated Processes Are Off-Limits to ChatGPT and Codex Computer Use — Where UIPI Draws the Line

Once you actually start using the [ChatGPT desktop app](https://chatgpt.com/download/)'s Computer Use as an AI tester on Windows, you hit a hard wall: no click or keystroke is delivered to any window belonging to an admin-elevated process. The cause is Windows' Mandatory Integrity Control (MIC) and User Interface Privilege Isolation (UIPI), which are designed to prevent a medium-integrity process from sending input to a high-integrity window at the OS level. This article walks through where that boundary sits, which tools it covers, the workarounds available in practice, and what the wall means for placing an AI tester, based on what public documentation confirms.