Embedded Technologies

Hi all,
I have finished building an application based on IBM's SMF framework which conforms to the OSGI standards. Currently, I am having a problem with connecting to the main server DB which resides on a Websphere server. Basically, user will enter information on their pocket pc and then save it to a local DB2e database. I thought about going with the synchronization solution with the DB2 Sync server, but really all the user is trying to do is updating records in the main server database tables and there's really no need to sync anything back from the server to the pocket pc. So, I m thinking maybe I should try to invoke a stored procedure that resides on the main DB server from my device, passing in parameters through a WLAN connection.
My question now is:
1. user should be connecting through a WLAN connection and my company have set up a login that prompts the user to login everytime they try to access anything on the server. It won't be nice if the user will hv to do that every single time. Is there a way that I can log the user in programmatically so they do not have to do it with a separate log in window?
2. Is calling a remote stored procedure a bad idea?
3. If the network goes down, then there's no way the users can update anything to the main server DB. So, the changes will be saved locally and once the network goes back up, the user should be able to update those changes back to the server. I am just wondering if it's bad to do a loop and send those updates to the server by calling the stored procedures repeatedly passing in diff. parameters? what safeguards do I need to put in? like what exceptions should I expect to catch? also, I would like to be able to track those updates that failed, how do I do that?
Any help will be appreciated. I tried to find resources online, but to no avail. I am not sure if I am overly complicated things. Please advice! Thanks alot everyone!