C4Context
	title System Context diagram for Internet Banking System
	Enterprise_Boundary(b0, "BankBoundary0") {
		Person(customerA, "Banking Customer A", "A customer of the bank, with personal bank accounts.")
		Person(customerB, "Banking Customer B")
		Person_Ext(customerC, "Banking Customer C", "desc")

		Person(customerD, "Banking Customer D", "A customer of the bank, <br/> with personal bank accounts.")

		System(SystemAA, "Internet Banking System", "Allows customers to view information about their bank accounts, and make payments.")

		Enterprise_Boundary(b1, "BankBoundary") {

			SystemDb_Ext(SystemE, "Mainframe Banking System", "Stores all of the core banking information about customers, accounts, transactions, etc.")

			System_Boundary(b2, "BankBoundary2") {
				System(SystemA, "Banking System A")
				System(SystemB, "Banking System B", "A system of the bank, with personal bank accounts. next line.")
			}

			System_Ext(SystemC, "E-mail system", "The internal Microsoft Exchange e-mail system.")
			SystemDb(SystemD, "Banking System D Database", "A system of the bank, with personal bank accounts.")

			Boundary(b3, "BankBoundary3", "boundary") {
				SystemQueue(SystemF, "Banking System F Queue", "A system of the bank.")
				SystemQueue_Ext(SystemG, "Banking System G Queue", "A system of the bank, with personal bank accounts.")
			}
		}
	}

	BiRel(customerA, SystemAA, "Uses")
	BiRel(SystemAA, SystemE, "Uses")
	Rel(SystemAA, SystemC, "Sends e-mails", "SMTP")
	Rel(SystemC, customerA, "Sends e-mails to")

	UpdateElementStyle(customerA, $fontColor="red", $bgColor="grey", $borderColor="red")
	UpdateRelStyle(customerA, SystemAA, $textColor="blue", $lineColor="blue", $offsetX="5")
	UpdateRelStyle(SystemAA, SystemE, $textColor="blue", $lineColor="blue", $offsetY="-10")
	UpdateRelStyle(SystemAA, SystemC, $textColor="blue", $lineColor="blue", $offsetY="-40", $offsetX="-50")
	UpdateRelStyle(SystemC, customerA, $textColor="red", $lineColor="red", $offsetX="-50", $offsetY="20")

	UpdateLayoutConfig($c4ShapeInRow="3", $c4BoundaryInRow="1")
