simple questions-cannot find answers in common books -- RPG400-L

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in rpg programming

1.in form type I what is the use of SEQUENCE  eg.AA etc

2.how are indicators U0-U9,MR used.

3.is there any way i can try out RPG programs using internet ie 
downloading or etc.

4.can a subfile be used to access data from different physical files if 
so how can an update pgm work on different physical files. 

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