thi is a total begineer, but just in case..i find this paragraph unclear some way (page 62)
"Click the ui_req port, click the call_req port, and then press Enter. A flow line appears
between ui_req object and call_req block."
i thought ui_req was a port, but when you name it as object, do you do it intentianally??, the same with call_req..a block?