an internal trasnfer is when you switch degrees within the uni.
each uni has their own internal trasnfer policy, if they have one. usyd doesn't have an internal transfer policy as such, it depends on the faculty you want to trasnfer to, but most faculties are relinquishing the policy and now you have to go thru UAC just like everyone else if you want to switch degrees within usyd and depending on the course, you have to get a d average or better to be considered for an trasnfer, eg. b. commerce
at macq uni, they have a policy where you have to get a c average or better and you can trasnfer to whereever in the uni.