function DirectoryExists(
    const Directory: string
): Boolean;

Boolean - True if the Directory already exists.

DirectoryExists is a Boolean function used to indicate if the specified Directory alreadys exists in the local file system. 

DirectoryExists returns True when the value in Directory is a valid file path that already exists in the local file system. If the specified value is not a valid file path, or the patyh does not exist, DirectoryExists returns the value False. 

Please note that DirectoryExists is declared for the Delphi 5 compiler only to avoid a dependency on the FileCtrl.pas unit in the Delphi 5 VCL. You may also use class methods in TIdSysVCL for the platform hosting the Indy library to access portable file handling methods.