Collision checking options in MC simulator

[Shiva.aero]

Can anybody please explain the Collsion checking options in MC simulator (Verify-> File ->Options)?

1. Why there are 3 categories (tool, stock & machine) ?

2. The options Fixture & Machine are with all 3 categories. How they are different?

3. Some of the options under tool category are indicated as "verify only". What does it means?

4. What should be relative value of Collsion tolerance in relation to the cut tolerance?

Please check the attachment for the image of verify option page.

[crazy^millman]

Good question there is no help topic covering these questions. Need to put this in the official forum and see if you get a bite.