Framelock

The time provider that use the frame number provided by the frame lock of the Quadro Sync card

The framelock is used to sync the Vsync of multiple appplication or server using the quadrosync card

For the framelock your nvdia GPU need to be synced. for example like bellow as a master or as a client (see the quadrosync documentation )

you can enable the Framelock in the Engine > GPU > Window Parameters configuration.

The status of the Framelock is displayed inside the FPS meter

the status are:

FLOCK Clu green : the framelock is enabled with multiple server ( via the daisy chain)
FLOCK Sys green: the framelock is enabled only on this system
FLOCK red: the framelock is enabled but did not join