[Zope] What is getObject(IDstring) API?

This is a truly inane newbie question, but I haven't found the answer in several hours of doc searching and trolling the sources of various products. All those autocompletion IDEs must have made me soft :) I want to take two string parameters of a python script and convert them to object refences, so I can pass them to the mxmRelationship.Relate(obj1,obj2) function. Parameter List: student, course context.relations.relate( context.getObject(student), context.getObject(course)) This is an impractical script, but I just want something to get my feet wet. For now the objects will be in the same folder as the Relations object. I presume whatever the equivalent API to getObject is will take a relative URL path to objects as well?