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dfUse()
Optimised file opening for data-entry objects
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Syntax:

     dfUse( <cFile>, [<nIndex>], <aFile>,
               [<cMode>], [<cAlias>] ) --> lOpen

Parameters:

     <cFile>    File name.
     <nIndex>   Optional index. If it is specified, it will be opened. The
     default value is -1 (all indexes).
     <aFile>    Array of open files
     <cMode>    Mode to open. SEE DDUSE
     <cAlias>   Alias to use

Returns:

     <lOpen> Is .T. if the file was correctly opened

Description:

     dfUse() is used for optimised file opening by dBsee objects. The file
     is added to the array of open files.

Example:

     LOCAL aFile := {}
     USE art NEW
     dfUse( "art", NIL, aFile )  // File art already in use
                                 // aFile := {}
     dfUse( "cli", NIL, aFile )  // File cli not in use
                                 // aFile := {"cli"}
     dfUse( "fat", NIL, aFile )  // Fat not in use
                                 // aFile := {"cli","fat"}
     dfClose( aFile ) // Closes all files opened by dFUse()

See also:

     ddUse(), dfClose()