Hello, I've been using smartclose for a couple of years.
I haven't tested if it's stealth, But it is portable. I copied the install files from another hard drive and it runs just fine.
It writes it's settings to:
everything else appears to be written where the executable resides.
Some other features of SmartClose:
Two wizards: the Close Programs wizard, for closing all the programs, and the Restore wizard, to restore a system snapshot. Both provide an intuitive and clear interface - the latest Windows 2000/XP wizard style - and assist you step by step.
Thanks to its SmartClose-technology, most programs can be properly closed, so that the program can still save its settings and return memory and resources to the system.
In the rare cases that a program can't be properly closed, SmartClose can use SmartKill to kill the program. Still, all the memory and resources used by the program will be freed with this method.
If you don't want a program to be closed or killed by SmartClose, you can add it to a list of 'Protected Programs'.
Besides closing programs, SmartClose also closes Explorer and Internet Explorer windows and saves their current location, so they can be restored properly later.
Disables and restores the screen saver.
Stops and restarts Windows NT/2000/XP-services, such as the Task Scheduler, that can interrupt other processes. On Windows 9x/Millennium, the Task Scheduler can also be disabled and re-enabled.
And finally, you get all of these features for free! SmartClose is 100% freeware without any nag screens, trial periods, ads, spyware etc.