Batch automate connecting to AS400's

I would like to write a CL/RPG set of programs that will run in 
batch. At 4 different locations (other AS400's) nightly jobs are run 
that produce files to upload to a central AS400.

I would like a batch job to run at 06h30 that will passtrough to the 
remote AS400's, receive the network files, restore them at central 
head-office. When done, end passthrough and connect to the next 
AS400. 

When all data is received, a batch job will then print a consolidated 
report. 

So my question is: What are DDM files, how do they function, and how does 
one apply this to run remote commands. 

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