# Lockdown browsers explained: what they can block, what they cannot, and why policy still matters | ExamFence Source: https://examfence.com/blog/2026-10-23-lockdown-browsers-what-they-block.html [Home](../index.md) / [Blog](index.md) October 23, 2026 - ExamFence **Short answer:** A lockdown browser is software that takes over the testing environment on a candidate's own computer: full screen delivery, blocked navigation, disabled switching and copying, and sometimes blocked virtual machines or second displays. It raises the cost of casual cheating inside that device. It cannot see a second device, a person in the room, or notes on the desk, which is why it is one layer, not a solution. ## What lockdown control actually covers On the candidate's machine, a well implemented lockdown browser prevents the common digital shortcuts: opening another browser or application, searching local files, using copy and paste from outside material, printing, or capturing the screen through standard tools. It also logs attempts, so a candidate who tests the walls generates a record the review team can see alongside the session timeline. Those controls matter most against opportunistic cheating, which is the majority in most programmes: the unprepared candidate who would search if searching were easy. Raising the effort and the detection risk changes that decision for most people. Integrity systems should be judged partly on this quiet deterrent effect, which never appears in a caught case count because the attempt never happened. ## Where the reach ends The second screen problem is structural. A phone, a tablet, a second computer, or a helpful friend sits entirely outside the lockdown's view. Virtual machine and remote access tricks also probe its edges, though good implementations detect many of them. A programme that treats the lockdown browser as proof of a clean room will design weak questions and skip human review, stacking all its trust on the layer with the clearest limits. Accessibility and compatibility are the other boundary. Lockdown software interacts with assistive technology, older hardware, and locked down work computers in complicated ways. Programmes must test the real combinations their candidates use, publish requirements early, and provide an alternative route for candidates the standard setup genuinely cannot serve. An integrity tool that quietly excludes legitimate candidates has failed at a more basic job. ## Policy and question design carry the rest Rules should state plainly what is allowed in the room, on the desk, and on other devices, in language a stressed candidate can follow. Ambiguity helps only the dishonest: honest candidates guess conservatively and lose time, while cheats exploit the grey areas and cite them later. Pair clear rules with identity checks and, where the stakes justify it, live or recorded review proportionate to the credential's value. Question design is the layer programmes underuse most. Randomised banks, questions that apply knowledge to fresh scenarios, and time limits set from honest completion data all reduce the value of smuggled answers, lockdown or no lockdown. A copied answer to a memorised question is useful to a cheat. A copied method for a novel problem still requires the candidate to do the work the exam exists to measure. ## Deploy it as one honest layer Communicate the lockdown for what it is: a standard, proctored style environment on the candidate's machine, required equally for everyone. Candidates accept controls they understand and that apply fairly. They resent and resist controls oversold as total security, partly because the overselling insults their intelligence and partly because every visible bypass then looks like institutional failure rather than a known limit being managed. Review lockdown logs with the rest of the evidence, not as verdicts. A blocked attempt flag, a focus loss, or a second display detection is a signal to look, proportionate to the pattern and the stakes. Programmes that combine a solid lockdown, clear rules, good questions, and human judgement catch more, accuse less, and defend their decisions better than programmes that bought one tool and called the problem solved. Keep reading: [Brain dump sites and exam content theft: how harvested questions lose their value](https://examfence.com/blog/2026-10-23-brain-dump-sites-exam-content-theft.md), [AI tools and remote exams: writing a policy candidates can actually follow](https://examfence.com/blog/2026-10-23-ai-tools-remote-exams-policy-guide.md), and [Second devices and screen sharing: closing the quiet cheating channels](https://examfence.com/blog/2026-10-21-second-device-screen-sharing-cheating-exams.md) cover the nearby cases in this series. ## Frequently asked questions ### What does a lockdown browser block? On the candidate's computer it blocks other applications and sites, app switching, outside copying, printing, and standard screen capture, and it logs attempts. It creates a controlled environment on that one device for the exam session. ### What can a lockdown browser not stop? Anything outside the device: a phone or second computer, notes, or another person. It also cannot fix weak questions or unclear rules. That is why it works as one layer alongside identity checks, policy, and good exam design. ### Why does question design matter if a lockdown is used? Because randomised banks and applied, novel questions reduce the value of smuggled or memorised answers. A cheat with outside help still has to do the reasoning the exam measures, which is the outcome the programme actually wants. ### How should lockdown flags be used? As signals for proportionate human review alongside the rest of the session evidence, not as automatic verdicts. Patterns and stakes should drive decisions, which keeps enforcement both stronger and fairer. ## See your own numbers. 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