SMS Re-cache changed files

Hi,

I have a NS 7.1 SMS policy that got pushed to about 90 systems. I needed to change a file. I have since gone ahead and done that and the new file is out on the respective package servers. How can I get the file updated on the client systems? Will Altiris do it for me or am I stuck? I know the NS can update the site servers, but can the site servers update the client systems if a file changes?