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+vlock is a program to lock one or more sessions on the Linux console.
+
+This is especially useful for Linux machines which have multiple users with
+access to the console. One user may lock his or her session(s) while still
+allowing other users to use the system on other virtual consoles.
+
+If desired, the entire console may be locked and virtual console switching
+disabled.
+
+On machines that support "Magic SysRq" (enabled via a compile-time option
+and /etc/sysctl.conf setting) users that lock all VT's on the machine must
+be members of the "wheel" group. Note that 12.0's stock kernels include
+support for the SysRq key.