Release 10.1A: OpenEdge Development:
Progress 4GL Handbook

> ## Passing a temp-table by value

> When you pass a temp-table as a parameter from one routine to another, whether those routines are in the same OpenEdge session or not, Progress normally copies the temp-table to make its data available to the called routine. Copying the table so that both the calling and the called routines have their own distinct copies is referred to as passing the table by value. This can be very expensive if the temp-table contains a large number of records. If you are making a local routine call, you can use `BY-REFERENCE` or `BIND` to avoid copying the table and thereby gain a significant performance advantage.

> When you pass a temp-table parameter in a remote call, the data is always copied from one routine to the other. That is, if the calling routine and the called routine are in different OpenEdge sessions, the temp-table parameter is always passed by value.

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