I'm using an existing
tikz example to create a flow chart of sorts, showing how applications and libraries communicate with each other in a software project. For example, the following image depicts two applications (ie: peers) communicating directly with each other:
What I would like to do with
tikz is to create a new type of element which consists of a square element with another square inside of it. I would use this to depict something similar to the above, but it implies that "Process A" requires the use of "Library B_API" to talk to "Process B".
How would I accomplish this with