serialVersionUID in EJB

Hi All !
I have few questions regarding the use of serialVersionUID in EJB.
I know it is used to expedite the serialization though still I am confused
about the use of it in following scenario:
1) I have a Baseclass of Stateless Session Bean, is it okay to put the field
"serialVersionUID" in Base class or I should put it separately in each
Session Bean?
2) Since right now we are planning to use Local Interfaces but in future we
may use Remote Interfaces, does putting "serialVersionUID" in SSB will
improve performance even while we are using local interfaces.
3) Is there a way to validate the value of "serialVersionUID", since I am
using the auto generated "serialVersionUID" by Jtest.
Your help will be appreciated.
Thanks

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