I added one TIB_Session (Name=AS_DLL_SESSION; UseCursor=False) and one TIB_Transaction (Name=AS_DLL_TRANSACTION; IB_Session=AS_DLL_SESSION) to the TWebModule2=class(TWebModule) form.

I create all database, table and query objects in code, using the three object types below. I typically use nil as the constructor parameter.

The first time the DLL app tries to access a database it blows up on the Create statement.

What am I doing wrong?
   
    TAS_IBODatabase = class(TIBODatabase)
    private
    public
        constructor Create(anOwner: TComponent); override;
    end;
    TAS_IBOTable = class(TIBOTable)
    private
    public
        constructor Create(anOwner: TComponent); override;
    end;
    TAS_IBOQuery = class(TIBOQuery)
    private
    public
        constructor Create(anOwner: TComponent); override;
    end;

constructor TAS_IBODatabase.Create(anOwner: TComponent);
begin
    inherited Create(anOwner);
    IB_Session        := WebModule2.AS_DLL_Session;
end;

constructor TAS_IBOTable.Create(anOwner: TComponent);
begin
    inherited Create(anOwner);
    IB_Session        := WebModule2.AS_DLL_Session;
    IB_Transaction    :=    WebModule2.AS_DLL_TRANSACTION;
end;
{$ENDIF}

constructor TAS_IBOQuery.Create(anOwner: TComponent);
begin
    inherited Create(anOwner);
    IB_Session        := WebModule2.AS_DLL_Session;
    IB_Transaction    :=    WebModule2.AS_DLL_TRANSACTION;
end;

Bjorn