Start up terminal and type
top
you'll see the following columns:
pid -- process ID. If you don't like the application (for example, Classic, which has problem quitting as well as TruBlueEnvironment which is the emulator part of Classic), you can later type
kill # -- # is the process ID displayed in top.
%CPU -- this one is straight forward -- % of CPU time
#TH -- number of threads ran by the app
#PRTS -- don't ask me
#MREGS -- similar.. guys fill me in on this one
RPRVT -- reserved private memory
RSHRD -- shared memory resources
RSIZE -- physical mem occupied
VSIZE -- virtual mem space occupied
to exit, press CTRL-C
