what is subfiles in rpgle

According to IBM, a subfile is a group of records that have the same record format and are read from and written to a display station in one operation. As the term suggests, a subfile is not a file; rather, it is a temporary place to store data of the same format to be used by a display file program.

Why Use Subfiles?

http://www.itjungle.com/mpo/mpo050803-story04.html 

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A subfile is a display file where you can place a listing of values and process changes on the list. The list of members that you can see in the PDM is an example of a subfile.

http://www.broculos.net/en/article/as400-chapter-9-subfiles 

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http://kevinvandever.com/subfiles-in-rpg/ 

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Subfiles can be specified in the DDS for a display-device file to allow you to handle multiple records of the same type on the display. (See Figure 187.) A subfile is a group of records that is read from or written to a display-device file.
http://publib.boulder.ibm.com/infocenter/iadthelp/v7r0/index.jsp?topic=/com.ibm.etools.iseries.pgmgd.doc/c0925076330.htm 

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A group of records that have the same record format and are read from and written to a display station in one operation. As the term suggests, a subfile is not a file; rather, it is a temporary place to store data of the same format to be used by a display file program..
http://en.wikiversity.org/wiki/What_is_a_Subfile