[support] Showing Blocks on Specific Pages

I've created a number of blocks, and after reading my Pro Drupal Development book and The Packt Drupal book, I'm wondering how I can make blocks show on certain pages. I know 'front' is the front page, 'admin' is the admin section. Is there a list of these standard words.

Again, I am using the standard Path module and Clean Url's so I have various nodes (Page content types) set to different paths like node-id 101 is 'about.htm'

So, if I want blocks to be on just this page 'about.htm', then what would I put in the 'show on this page'? I tried 'about.htm' but that didn't really work.

If someone can just point me in the right direction, that would be great! Thanks!