"hiding" programs

I've just downloaded Morpheus in order to check it out. My kids have been after me for a while to let them use it. I don't won't them to know I have it downloaded till I've had time to look it over. Under the best of circumstances I think that I will need to exercise quite a lot of control over its use, IF I decide to keep it.

 My question is, can I remove all traces of it on the kids' user account? I don't seem to be able to remove it from the program list without deleting it from my account too. I don't want them to see any traces of it when they login under their names.

 Thanks for your anticipated help.           Crakatau