如何在R中找到附加数据集的列表？

Is there any method in R to find out what data-sets have been attached. In my work flow i use the console and build a script. I try out the lines of code in console and once i am satisfied with the results, i add them to a script so that I can reproduce the results later. For past week i have been playing with a few data-sets. I think I attached and detached a number of them over time. But now I need to know what data-sets are current attached, so that I can detach them. to find out what data-