My desktop moves and I can't use my mouse

Okay, I'm not sure how to describe this, but here goes...
Today, I was holding my baby on my lap, and she did something to my computer, and when she did, it was like my entire desktop moved, and on the left side of my screen, there was a black bar followed by a bar that had a triangle at the bottom, kind of like a power button or something.  But no matter what I did, I couldn't get it back to normal.  What was worse was I couldn't click on anything - I could move my mouse cursor, and I could use the keyboard, but no clicking.
I basically forced my computer to restart, but still I can't figure out what she did or how to duplicate it, let alone how to get out of it if it happens again.
I'm running Yosemite on a MacBook Pro.
Sorry for the weird question, but thanks if you can help!

If you have a rescue email address (which is not the same thing as an alternate email address) set up on your account then the steps half-way down this page should let you reset them : http://support.apple.com/kb/HT5312
If you don't have a rescue email address (you won't be able to add one until you can answer 2 of your questions) then you will need to contact iTunes Support / Apple to get the questions reset (we are fellow users here on these forums).
Contacting Apple about account security : http://support.apple.com/kb/HT5699
When they've been reset (and if you don't already have a rescue email address) you can then use the steps half-way down the HT5312 link above to add a rescue email address for potential future use

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