Depends.

To wake me up in the morning, Samantha will put her front paws on the bed and paw me with one of them.

If I'm on the computer, she will come up and nudge at either my back/butt or hit my elbow.

If I'm on the phone, she'll come up and stick her nose right by my <unmentionables>.

If she wants to go outside and I'm on the couch watching TV, she stands in front of me, does a low boof and stares until I ask her if she wants to go out.