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By default, all RDML functions attempt to "overlap" the first user/screen interaction with a mass opening of all the databases files which will be used by the function. In other words, while the user is working with the first screen, a concurrent open of the database is being performed. Effectively, this technique is designed to reduce the user's perceived response time.
Although this approach always works, in some situations it does not perform the required action in the best possible way. For example, some of the situations where this action may not be the best result are:

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                OPEN FILE(*ALL) USE_OPTION(*ONDEMAND)
     then the RDML compiler will decide that there is never any need to overlap file opens with the first screen I/O, and will thus use DFRWRT(*YES) when creating the associated screen display file. This should improve perceived response time for remote users and reduce the overall system load of the program.
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