Interactive is usually more convenient, but batch mode allows more memory for larger data sets. Also there is a special startup configuration defined for RATS batch mode. You normally won't need this unless your dataset is very large. Allow a couple minutes for the program to load. Login with your own user name and password.
Access is in batch mode.
Gauss Gauss is a programming language primarily used for optimizations. For more info press click on the help menu. Dataset size is limited to available RAM, so it cannot handle very large datasets. Access from Stata from Windows by double clicking Stata. Stata for UNIX is planned, although not installed as of this writing.