Introduction to Pathmaker

Overview of Pathway
Introduction to Pathmaker and Pathway
067867 Tandem Computers Incorporated 1–17
Figure 1-7 illustrates communication using IPC messages between a requester and a
server containing a List Vehicle by Vehicle ID Service.
Figure 1-7. IPC Messages
1. End user fills in vehicle
ID number.
2. End user presses
function key for List
Vehicle by Vehicle ID.
3. Request message is
sent.
7. Requester displays
screen.
4. Service reads database
using vehicle ID number
in request message.
5. If vehicle ID is found,
reply message with all
vehicle data is returned to
requester,
or
if not found, reply
message contains
“Vehicle ID number not
found” plus error codes.
6. Reply message is sent
back to requester.
(Vehicle ID)
Request IPC Message
Reply IPC Message
(Vehicle Type, Year, Make, Model, and so on
or Error Message)
Server
007
Requester
List Vehicle by
Vehicle ID Service