How to monitor GPS Receivers of logged-in registered users 24x7 ?

In the web server application, many users are registered. During the registration process application gets the unique ID of user's GPS Device and also user's mobile number. There will be a midlet installed in each and every registered user's mobile/PDA.
How can the server-side application be made to fetch the GPS data (longitude/latitude/speed of movement) in NMEA standard from the registered user's mobile very periodically ?
The midlet can be made to send the GPS data via SMS to the application running in web server.
demerits:
1.user will be forced to pay for each and every SMS, sent through GPRS to the web server.
2. the time took by SMSC (Short Message Service Center) to transfer the SMS from mobile to the web server might be long
3. Since it uses WDP protocol which is built on top of UDP, messages might be broken
I'm aware that any registered user can be tracked through LBS (Location Based Services) and also through user's Mobile Service Provider. I'm trying to track the registered user only with the help of user's GPS Device.
Are there any possibilites to establish connection between J2SE/J2EE application and a satellite receiver, and then get the GPS parameters of a specific GPS receiver?
Is it possible to determine the name/location of a satellite for a specific region so that it can be queried for GPS parameters of a specific GPS device?
If yes, how it can be accomplished?
PS: When the registered user invokes midlet, he/she knows that he/she will be tracked by the remote application. User will be tracked one and only if that specific midlet is invoked explicitly by the user.

Hello Sagar,
You have to write an application in that u have to use the follwing code
Step 1:
import the Files like
import com.sap.security.api.IUser;
IPortalComponentRequest request = IPortalComponentRequest)this.getRequest();
IUser usrSO =request.getUser();
strSOID = usrSO.getUniqueName();
Step 2:
Create a table at DB with the fields like userid Time and required filelds...
Step 3 :
Deploy your application and create a iview from PAR
then create a invisible iview or attach the iview at the end of the page and attach this in every user role
when the user logged in auto matically his ID will stored in the DB..
Try to attch this iview in visible mode into System Admin role ..see the Number of users logged in
But u have to write a efficient application for this
Don't forget to award points ....
Sreedhar G

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