Ho to do for automatic updates

Hi,

I'm interesting into take knowlege on automatic updates procedure online.

I think that one way to do this is to put the update package on the server and give the program the possibility to check for updates. Then, the end user can choose to download it or no.

Another way is give the program the possibility to check, at regular time interval (one week, one mounth) for updates and ask the end user if he want download it (or no).


Can you suggest me documents and/or software examples that do this ?

Thanks in advance

This is a problem with used software , isn't it ?
Second, if you leave it in the server and raise a banner on the client everytime there is needs of download, how sure are you that the client will do it ?
Your software is the only "must" ?