Affect of local DB on change of remote url.

Hi,

i am an ipad application developer using objective c language,

Assume that i am syncing to remote url using function,
[database replicateWithURL: "REMOTEURL" exclusively:YES];

(say REMOTEURL: abc:xxx@xyz.iriscouch.com/databasename)

now if my app. user tries to use other remote url (say REMOTEURL: abc:xxx@kkk.iriscouch.com/databasename) and try syncing.

what should be the end result?

does it removes all data previously synced or it overwrites the data or simply, it just appends to previously synced data.?

please let me know if there is any document which clearly specifies the reason.

waiting for your reply,

krishna shanbhag.