see..if u dont want parameterization means u have to use 
constant values only. how u can generate user name and 
password automatically.

The above is not my answer. So if you don't know, no need to
answer.

You can generate username and password using random number 
within a range ..convert the generated random numbers to 
string using chr.

Aparna u are correct..but he doesnt want parameterization. 
thats what i mentioned in the above answer. if u generate 
random number and passing that to user name and password, 
it is one of the parameterization techique. Am i correct?
               and another way is u can take the values 
from environment, but this is also one of the 
parameterization.

I think we can do this by writing a function...

Hi Rico could you please tell us what will be the content 
inside the function.

Hi 

I ont knw when this was posted 

but answer could be by regular Expression, since there will 
a function which will restrict the charecters of a username 
and pwd , i think using this we can do it 

also QTP has a option to test regular expression

http://www.allinterview.com/showanswers/73047.html Check 
this link Aparna...Somebody has already stole my thuder

With the help of regular expression
[A-Z]+[a-z]+[0-9]

we can write like this

Browser("name:=Browser").Page(name:=Page").WebEdit
("name:=username").Set "abc"
Browser("name:=Browser").Page(name:=Page").WebEdit
("name:=password").Set "abc"