What is the function of recommend-er registry in R




While learning about implementing recommenders in R I am trying to execute some code a part of which uses recommenderRegistry function in the recommenderlab package.

recommenderRegistry$get_entries(datatype = "binaryRatingMatrix")
reco = as.matrix(whiskey)
reco = as(reco,"binaryRatingMatrix")
scheme = evaluationScheme(reco,method = "split",train = 0.9,given = 1)

The output of the recommenderRegistry part:

I understand that the various ways in which recommendation engine can be built are given here,but I want to know what exactly this function achieves?
Can someone please help me with this??