Kubuntu - AMD 64 bit installation newbness

[Donn]

 > In Dapper:
> 
> linux-image-686.
> 
> All you have to do is:
> 
> sudo apt-get install linux-image-686
> 
> then reboot.  I think this is somehow obsoleted in future versions, but
> it should still work, even if it may not really install an SMP kernel.
Is there any official page for *buntu that clears up the smp question? 
i.e. what kernel one can install on Dapper to take avantage of the 64bit 
*and* the smp bit.

Just to clear it up -- sorry if it's been answered already -- if I boot 
off my old Dapper drive, apt-get install a new 64bit smp kernel 
(assuming I get a package name), will I be able to use all the ALREADY 
installed 32 bit apps like KDE etc on that new-fangled kernel?

/d