select command in smart card and status word

Question

I use smart card and I upload different applet on the Smart Card. Q1:**When I Select one applet with PyApdu.exe and after select another applet without reset connection with card reader **SW=9000 return. Is it good behavior?

Q2: If select applet with PyApdu.exe tools and return SW=9000 and after this I select another applet that AID there is not in applet list of smart card and return SW==9000 is it good behavior?

Answer 1

That is bad behavior. Versions of the old Muscle applet are know to do return 90 00 for any AID. Well behaved applet will return an FCI with a 4F tag containing the AID when selected. For example OpenSC added code to check for this bad behavior in several drivers. Find a better applet to load.