Examples disclosed herein relate to a conference call host. Examples include to establishing, by a first computing system, a first secure connection to a second computing system via a wireless network in response to receiving a secure connection request from the second computing system; the first computing system and the second computing system are in physical proximity to each other. Examples include to provide an operating system session to the second computing system through the secure connection while the first computing system and the second computing system remain in physical proximity to each other; the operating system is stored on and executable by the first computing system. Examples include to provide a connection to a conferencing platform to the second computing system via the first secure connection, the conference call at least among the first computing system, the second computing system, and a remote user.