You can't. If you want to see what is running on your system, open a terminal and type
ps aux
that will show you a list of running processes/apps.
That however is only one way of watching what you are doing. They could be monitoring your internet use in a variety of ways that you will not be able to detect.
If you are really really concerned, you should just get rid of who you think may be doing this. Your a boss...use your powers of evil!! Conversely, if you have superiors that you think may have ordered this surveillence, you may want to look at what you are doing (not to imply that you are actually doing anything wrong).
Sorry if the answer is a bit disjointed, still working on my first cup of coffee this morning