Disabling Email, Instant Messages, and Alerts with Brightspace if you're using the Lockdown Browser

In a quiz's settings, under Timing & Display, you can disable Email, Instant Messages, and Alerts with Brightspace. If you're using the Respondus Lockdown Browser with the quiz, is it necessary or redundant to use the setting to disable access to email and instant messages? Is there any benefit to using the two settings together? Thank you.

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