Can RMAN backup certain datafiles and recover just those dataFiles

RMAN questions,

Hopefully it's not to dumb. 

1. Can RMAN do a full backup of just certain datafiles and lay them out on 
another system?

2. If so, can you then do incrementals on those datafiles?

3. Lastly if one and two are possible - what if you modify the destination 
database say update a row that lives in the datafile you are doing increments 
on,  will applying the RMAN incremental datafile file fail?

Thanks in advance....
-Lizz 

                
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