Dear Sir,
Thank you for your reply. I would like to make things more clear and please
pardon me for some more questions.
If I decide to use hacks to do nothing for TimSetSeconds(), is it true that the
user can simply dis-able the hack in hackmaster and then even delete it? Am I
correct?
Are there any software as an example that demonstrate "Application Launcher
will
let you share the program between two palms" ? I don't know this is possible.
Thanks a lot again.
Best regards,
philip
Kenichi Okuyama wrote:
> >>>>> "PH" == Philip Ho <[EMAIL PROTECTED]> writes:
> PH> There is one application which uses system time to keep track of the
> PH> work progress of the worker (user). But, as you know, the worker (user)
> PH> can easily change the system time in the Prefs application.
>
> I do not know why you need to let not user keep out of changing
> time, but I beleave even blocking the way you have told, will not do
> any big work.
>
> Dragnball/EZ Dragnball which Palm is using, have Real Time Clock
> unit inside. You can easily write a program to change the value of
> RTC directly. If you change the RTC, system time will automatically
> change too, without any notice launching from OS.
> # And, to install/deinstall such program is quite easy.
> # All you need is another Palm with IR. Application Launcher will
> # let you share the program between two palms, you know.
>
> I beleave first thing you have to do is think about case above.
> If you can't accept the above case, I mean, if you want to say that
> you also want to prevent user from accessing RTC directly, I beleave
> using MC68000 or Dragonball is mistake. You need CPU with MMU, like
> MC68030, which have strong protection against user mode. So,
> choosing Palm is not the right choice.
>
> If you can accept the case above, then story is quite easy.
>
> Create the Hack that will do "nothing" for TimSetSeconds().
> Then nobody can change the system time.
>
> When manager( or who ever that is ) wants to adjust the system time,
> install the application that will access 'RTC' directly. And adjust
> the time using the RTC direct access. Unless you want to change the
> date, this, I beleave, will work fine.
> ----
> Kenichi Okuyama@Tokyo Research Lab. IBM Japan. Co.
