at runtime qtp recognize object using mandatory 
properties..if the mandatory properties are not sufficent 
to recognize the object then it's go to assistive 
properties...attached text is one of the property to 
recognize the object .suppose the edit box of Agent name in 
flight reservation attached text property is "AgentName:"

if u want to change the mandatory or assistive properties 
go to the object identification...already default 
properties of mandatory and assistive properties are 
available in object identification .No one can give the 
answer comman properties of mandatory and assitive 
properties..because the properties are changed depends on 
the environment..like standard windows,web,visul 
basic,java...ok..