在多数情况下，隐式打开就足够了。
图3详细展示了处理一个rpg隐式文件打开操作的过程和主要函数的代码片段。
Figure 3 details the process of handling an RPG implicit file open operation along with code snippets of the major functions.
RPG文件打开可以在RPG初始化阶段隐式发生，也可以通过RPG OPEN操作或在文件定义上使用USROPN关键字显式发生。
The RPG file open can occur implicitly during the RPG initialization phase or explicitly via the RPG open operation and the use of the USROPN keyword on the file definition.
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