LU 6.2 API Application Programmer's Reference Guide (30294-90008)

24 Chapter1
The SNA Network and LU 6.2 API
Systems Network Architecture (SNA)
An Example Transaction With APPC
The following example is the same transaction described above, but the
local computer has APPC capabilities, and an APPC application on the
local system automates communication with the central mainframe.
Now the clerk must perform the following tasks:
1. Log on to the local processor.
2. Run the appropriate application.
3. Gather all pertinent information, whether it is on the local computer
or the mainframe at the central office.
4. End the application.
The clerk has to run only one application on the local computer, because
the local APPC application does the following:
1. Logs on to the mainframe.
2. Executes the mainframe application.
3. Gathers the appropriate information.
4. Ends the application.
5. Logs off the mainframe.
If this is a process that is done repeatedly, and part of the information
must remain at the central location, then an APPC application saves a
great deal of time. Also, the clerk does not have to know where the data
resides in order to run the application. The clerk performs the same
steps whether the data resides on the local processor or the central
mainframe.