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dfAlias2Name()
Return the name of the database of an alias
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Syntax:

     dfAlias2Name( <cAlias> ) --> cFile

Parameters:

     <cAlias>   Alias of the file

Returns:

     <cFile>    Database name

Description:

     With this function you can know, if a database is opened with one
     alias, what is the name of the database. With this information you can
     search in the DBDD in a correct mode

Example:

     dduse("video","newfile")
     
     ? dfAlias2Name("newfile") // Return video
     ? dfAlias2Name( ALIAS() ) // Return video

See also:

     ddUse(), dfUse()