the installer should take of placement for you.  as for directly
referencing in code (should there be a need), you can reference
relative to your current directory --  I use
Environment.CurrentDirectory for this during the loading of the main
form (there may be issues with using it later, but I have not tested
this).  You can also use Reflection to get the Location or CodeBase for
the Assembly (it is my understanding that this can be a bit expensive
memory-wise, which is why I use the other approach.  This approach
should be durable though)