this is no better confusion-wise... :-)

Just to make sure what we are talking about, mine would be:

void Shared1(void) {
   -- any code needed to set the appropriate register set --
#include blahblah.anyextension
   -- any code needed to restore the default register set --
}

void Shared2(void) {
   -- any code needed to set the appropriate register set --
#include blahblah.anyextension
   -- any code needed to restore the default register set --
}

and blahblah.anyextension file would contain only the body of the function.

JW