Biasing techniques UI commands

Particles, Track, Event, Run and Biasing
1

hello Geant4 users,
I want to ask about the meaning of the following commands:

/process/em/setDirectionalSplitting true
/process/em/setDirectionalSplittingTarget 1000 0 0 mm
/process/em/setDirectionalSplittingRadius 10 cm
/process/em/setSecBiasing eBrem world 100 100 MeV
/process/em/setSecBiasing Rayl world 100 100 MeV
/process/em/setSecBiasing phot world 100 100 MeV
/process/em/setSecBiasing compt world 100 100 MeV
/process/em/setSecBiasing annihil world 100 100 MeV

and the difference between these two commands

/process/em/setSecBiasing eBrem world 100 100 MeV
/process/em/setBiasingFactor eBrem 200 true

best regards.