Regarding File Sharing Permissions, what is difference between Allow unchecked/Deny unchecked, and Allow unchecked/Deny checked?

In Windows XP, if I right click a folder in Windows Explorer and go to "Sharing and Security", and then the "Sharing" Tab, and then "Permissions", I am offered the following choices:

Allow or Deny:
Full Control
Change
Read

What I don't understand is you can:
Uncheck Allow and Uncheck Deny
or
Uncheck Allow and Check Deny

What is the difference???  If Allow is unchecked doesn't that imply Deny?  I assume there is a finer point I am missing here.  Any help is greatly appreciated!
markabe1Asked:
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sunray_2003Connect With a Mentor Commented:
Hope this para can be clear and not confusing. Didnot want to confuse you with my statements,
See if this makes some sense
http://www.pcguide.com/ref/hdd/file/ntfs/secRes-c.html

Read this:

Windows 2000 offers much better control over how permissions are assigned, as well as the benefits of dynamic inheritance and advanced inheritance control. However, these extra features make permission resolution much more complicated. In addition to the potential conflicts caused by users being in more than one user group, as above, you can have conflicts between permissions that were set for the object directly and those that were inherited from any of the object's predecessors: its parent, grandparent and so on. Furthermore, the existence of both "allow" and "deny" permissions complicates matters further. To deal with these complexities, Windows 2000 uses an algorithm that follows these general rules:


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