Vague? Maybe a little but maybe I can give a little more insight to this topic. Yes, you definitely can run pro tools on a laptop. Will it run well? Will it constantly throw errors and crash? It all depends on the hardware. I have a late 2008 Macbook (first aluminum) with a 2.4GHz Intel Core 2 Duo and some upgraded hardware/software. I am running the latest OS X Yosemite build and upgraded the RAM to 8GB. I also upgraded the internal hard drive to a 240GB SSD (Solid State Drive). This laptop was already struggling opening basic applications such as iTunes, Google Chrome and iPhoto. The response and speed improved significantly after the upgrade. On a side note, I also personally believe that Mavericks was a buggy operating system in relation to the other OS releases. I've been fairly impressed with the compatibility of Pro Tools 11.2 and OS X Yosemite even considering that it's not a compatible release.
Things to keep in mind if you want to optimize your laptop for Pro Tools or any other software that requires heavy processing power.
1. You can take the load off of your processor by upgrading the video card
2. Get a high performance SSD installed.
3. Upgrade your RAM.
4. Use SMC fan control to help keep the laptop cool while mixing.
5. Repair disk permissions using disk utility or Ccleaner.
6. Close all unnecessary programs while using Pro Tools