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| All MFSes must be located in the SYSPROG account. OpenInsight does not do any inheritance checking. Thus it is not possible for different versions of an MFS in different accounts to be recognized. |
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OpenInsight file operation requests originate in BASIC+ commands such as READ, WRITE, DELETE, LOCK, UNLOCK, SELECT, READNEXT, or in System Monitor routines such as ATTACH_TABLE, DELETE_ROW and LIST_TABLES. Developers write these commands into their programs, or execute the routines from the System Monitor, to control the flow of data to and from the file.
When a program or routine executes, each file-oriented statement becomes a call to the filing system. For example, if an BASIC+ program encounters a READ statement, and the file being read is a Linear Hash file, OpenInsight generates a call to the program RTP57, the Linear Hash BFS, with the appropriate "read" code.
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