There shouldn't be any global variable for such usage in project using requirejs as it is to handle modules and all modules (and their properties/methods) are never declared globally to keep the environment nice and clean. If you need one module to use a variable set in an other module then they should either talk to each other via some API or have that variable set as a property, require the module and get the property that way.
But maybe you should ask yourself if you actually need requirejs. If you want to build a proper module based application (which I am not sure you are if you wonder how to pass variable around) then yes, if all you want is to load few files from JS then LazyLoad (http://www.appelsiini.net/projects/lazyload) is probably the answer. Just saying it's worth thinking about depending on your case specially considering the footprint of requirejs.
