This command is used to change global settings which affect the entire VirtualBox installation. Some of these correspond to the settings in the "Global settings" dialog in the graphical user interface. The following properties are available:
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machinefolder -
This specifies the default folder in which virtual machine definitions are kept; see Section 10.1, “Where VirtualBox stores its files” for details.
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hwvirtexclusive -
This specifies whether VirtualBox will make exclusive use of the hardware virtualization extensions (Intel VT-x or AMD-V) of the host system's processor; see Section 10.3, “Hardware vs. software virtualization”. If you wish to share these extensions with other hypervisors running at the same time, you must disable this setting. Doing so has negative performance implications.
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vrdeauthlibrary -
This specifies which library to use when "external" authentication has been selected for a particular virtual machine; see Section 7.1.5, “RDP authentication” for details.
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websrvauthlibrary -
This specifies which library the web service uses to authenticate users. For details about the VirtualBox web service, please refer to the separate VirtualBox SDK reference (see Chapter 11, VirtualBox programming interfaces).
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vrdeextpack -
This specifies which library implements the VirtualBox Remote Desktop Extension.
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loghistorycount -
This selects how many rotated (old) VM logs are kept.
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autostartdbpath -
This selects the path to the autostart database. See Section 9.24, “Starting virtual machines during system boot”.
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defaultfrontend -
This selects the global default VM frontend setting. See Section 8.12, “VBoxManage startvm”.
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logginglevel -
This configures the VBoxSVC release logging details.[40]