A: First Steps to use AnyDAC 

A: AnyDAC Trial version: 

• does not include the library source code files; 

• an AnyDAC application shows "nag" screen on start, if a Delphi IDE is not running. 

A: Yes, it is. Read Multi Threading for more details. 

A: Read Handling Errors for details. And the code sample: 

uses
  uADPhysIBWrapper;

  try
    ...Login to Database...
  except
    { Login not correct }
    on E: Exception do
    begin
      if (E is EIBNativeException) and
         (EIBNativeException(E).Errors[0].ErrorCode = 335544472)
      then
        ShowMessage(strUserUnkown)  // your Errormessage
      else
        ShowMessage(E.Message);
    end;
  end;

A: In Delphi 2009:

• TStringField is 1 byte ANSI string field;
• TWideStringField is multi-byte Unicode string field.

So, that is correct behavior. Also read Unicode Support for details.