The Process will appear as a concurrent statements seen from the outside.

In other words:  If you got two or more processes will they always be executed in the correct order.

The sensitivity-list indicates which signals allowed to trigger the process.
You will learn from the literature that the sensitivity-list can be replaces by wait on and wait until statements.
This however not acceptable by the synthesize tool.

The statements inside a process considered sequential - hence are they executed in the order they are written.

If the process meant to describe combinatorial logic (Combinatorial process) must all input signals and internal signal be in the sensitivity-list.

Your allowed to define variables inside a process - note! shared variable could be used as well.

The difference between signal an variables important to understand.

	A signal known by the <= assignment and a signal will first get its value when the process concludes.
	A variable known by the := assignment a variable will get its value immediate with the assignment.

Consider if you was forced to convert Var0 to be a signal - which changes should be made?