DI-524 : unsure of wireless security

Archived from groups: alt.internet.wireless (More info?)

I am using a DLink DI-524 router. I do not have any wireless devices
presently to fully utilize my wireless router. I was curious, by not
setting up a specific MAC address, (because I do not have any) does
that leave my computer vulnerable to hackers?

I do have a unique username/password for changing the settings of
the router; does that help with the actual use of the router
connection?

PS If someone were to access my system wirelessly, what control would
they have?
would I see my mouse move radically?

bill