Using descriptive programming, you can define all the 
objects in the script itself..you dont necessarily need to 
use OR for that...

Thank you for the answer. Can u please give me an example 
so that I get a clear Idea ?

dialog("regexpwndtitle:=login").winedit("attached 
text:=Agent Name:").set "raju"
dialog("regexpwndtitle:=login").winedit("attached 
text:=Password:").set "mercury"
dialog("regexpwndtitle:=login").winbutton
("regexpwndtitle:=ok").click
window("regexpwndtitle:=Flight Reservation").ActiveX
("acx_name:=MaskEdBox").Type "080808"
window("regexpwndtitle:=Flight Reservation").wincombobox
("attached text:=fly from:").Select "Denver"
window("regexpwndtitle:=Flight Reservation").wincombobox
("attached text:=fly to:").Select "London"
window("regexpwndtitle:=Flight Reservation").winbutton
("regexpwndtitle:=flight").click

We can create and run the scripts without Object Repository,
Object Repository is nothing but collection of properties 
and corresponding values. Each collection represents an 
object.
Descriptive programming is a way of specifying properties 
and values without using the OR interface.
Throwing the properties and values straight into the 
command.

Ex:
Systemutil.Run"www.mail.yahoo.com"
Set a=Browser("name:=Yahoo!.*").page("title:=Yahoo!.*")
a.WebEdit("name:=login").Set "yourusername"
a.WebEdit("name:=passwd").Set "xxxx"
a.Webbutton("name:=Sign in").Click

You can try this code.It should work if you provide valid 
username and password.
Let me know still if you are not clear on this.