Progress
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Multi-user Programming
Perhaps the most significant topic that the tutorial does not cover is programming applications that can be accessed by more than one user at a time. The whole topic of database access needs to be revisited if you are programming for multi-user access. The central concept behind this discussion is the idea of record locking. What should Progress do if more than one user wants to access the same record? Basically, Progress can lock a record from being accessed by a user while it is in use by another user. Progress has default locking behaviors designed to prevent the kind of database corruption that can come from many users all trying to write data at the same time. However, you can also take control of locking behavior to give your application the amount of protection it needs.
For a discussion of locking and other multi-user programming issues, see the Progress Programming Handbook .
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