How to check for process/Application during sis Installation

Hi,

I was trying to create a sis, which will first check whether the a process / applicaiton of same kind is running on the phone/memory card.  If the application is found already on phone, i should able to tell the user that already the application is installed please unistall to continue.

Problem what i face now is , iam not sure whether the user has installed app on memory card / Rom to check for the exisiting running application. Because second time user tries to install, i should be able to look up the running application of same kind which is installed in "C: driver" or "on Memory Card".

I would like to know

1) Is there anyway to know at the time of installation, to find out from which drive either (C: or Memory Card) application is running ?
2) If found the application, it should able to abort the intallation process?
3) During the installation is there anyway to find out running "application/process" by their UIDs?

Any inputs appreciated


~Ramesh