All US registered aircraft have a Mode S code, it is also written on
your registration card. If you ever install a Mode S transponder; ATC
will know who you are, what you're flying, your N number, your
political affiliation, left-handed or right-handed, IFR equipped and if
you've made any international telephone calls to Osama - without you
telling ATC over the VHF. ;-)

Gotta go put the landing gear back in the Nimbus and stop all this
humorous typing.

Jim