Multiple Device iTunes Syncing

[RM305]

Up until recently I've been the only one using itunes for my iphone 4. Within the past week I bought the wife an iphone 4S and we also purchased the ne iPad. Now I am confused on how to go about syncing content to iTunes. I set up my wife's phone with her own Apple I.D because we don't want to have the same content in our phones(I have set up the iPad w/my Apple I.D as well). Ive searched google and came across two methods od creating and using seperate iTunes Libraries.

1-Create seperate windows user
2-Create different iTunes library(shift + open iTunes method) w/in same windows user login. **this method I would prefer the most**

Now here is my issue:

I attempted to try method #2 and as directed to do so in order to switch libraries for its respective device you are required to close out itunes and do "shift+Open iTunes" and choose the approriate library you want to use. Now I did that and even though I choose the library I want to use for the desired device to sync I always get a message about " the device was used with another itunes library and all its content will be erased and replaced .
is this message suppose to always happen or am i doing something wrong?

[Wyman]

Hm, sounds to me you are opening the wrong library.

Did you already sync each of the devices to the appropriate library?

[RM305]

While I was tempting to sync with the New created library I guess it was conflicting with the original library which was on a second windows login I had created. I deautherized that iTunes library and deleted the windows user login and all is fine. Thanks

[Wyman]

Glad issue was fixed.

[RM305]

Glad issue was fixed.

Thank You