>>>5: UNIQUE indexes, not only are they misused but they could easily be totally removed from the product without any alteration in capabilities.
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>>I have never understood these and have avoided them.
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>I have never used a UNIQUE index in an application, but I find them useful at the command line. For example, I want to know all of the different codes that have been used in field RESERV.cPayer:
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>index on cPayer to TEMP unique
>list cPayer
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>Peter Robinson

It may also be used in dynamic cursor processing, e.g. you collect some entries to a cursor (e.g. within a loop) and then, when loop is over, you want to go through the cursor picking up only unique entries. The main problem of UNIQUE index is that it's not maintainable but for temp cursor it does not matter.