SYSFRAME.SV and FRAMEVAR.VR files

Whats the difference between the two subject files? Looks like when i only load the sysframe.sv file, the data for my various frames will update accordingly. What is the framevar.vr file for? Curious about this, as i usually create the frames on roboguide then will transfer the configuration to a real unit. I'm just trying to understand which files i need for sure so i don't miss anything during the transfer.