Fixed computer CON mouth, is there any way I only need to use the COM2 port, for example, no matter how much I plug USB end device, it can be the default COM2 mouth! Or after insertion, is there any way a changes directly into COM2 port! Manually change I will, only if there is any faster way to guarantee? Do not know to have a great god help! Operation is as simple as possible, as if they were. Bat file, could you carry out?