User blog comment:ヌヌハラ/alice-tools v0.2.0/@comment-45214281-20200313112813/@comment-45214281-20200315101742

Looking at how N and A are called, it seems like N is for adding a new line and A is for adding the screen last line. Inside R's code I see these instructions DG_CALL and DG_CALLBEGIN. Do you know these ?