I asked a similar question regarding an alternate email program here My similar question about an email client, and got a logical answer. Thanks.
However, what happens, I now wonder, when you install another home locker program( I presume this is the name for the software that locks your screen , no ) ?
Since the device itself 'locks' your phone, you may not be around to choose the one you want to use.
Or does , installing another one, automatically disables the current ?