Sequence diagramm

hi i am having problem with the sequence diagram , i am developing for a coursework a system similar to facebook. appear clear that this system have a gui . how do i represent the gui in the implementation model ? the gui is related to everything. wht are the relationships

GUI is a single logical package or componenet, contains all your GUI-functionalities.
So it means in your sequence diagramm you can either use GUI as package to present an abstract view. Or you can use an object name in your GUI-component for presenting your sequence diagram in detailed view.

I hope it will help, if you give me an example i will send you a sequence diagram you need.

bye there