Trying to wrap my head around organizing a sharepoint infrastructure. I was going to do a Site Collection for each division. But, lets say I have the MIS division which has a helpdesk issue tracker app. Everyone in the company needs access to that app to log tech support issues. How can I add an app from one site collection to another site collection? Maybe I'm conceptualizing this wrong? There's a lot of information out there, but I'm having trouble making sense of how one would build a sharepoint intranet which conforms to an organization departmental structure. I know this question is a bit open ended, but I was hoping someone could at least help point me in the right direction.
Edit: I was thinking about this and I realized I could give every dept an issue tracker app and then put links to all of those apps on like a "help desk" page for the support guys.