Windows 7: File Sharing between XP-W7 Computers

I have created my share folders with "everyone" permissions to read, write, and modify as explained (well) here:

Share Files and Printers between Windows 7 and XP :: the How-To Geek



But when I go to copy a file from the XP computer to the Windows 7 computer I get the "Cannot Copy: Access is Denied. Make sure the disk is not full or write protected and that the file is not currently in use" message. I can copy files from the Windows 7 computer to the XP computer.

What more do I need to do to create "Easy File Sharing" between my home networked computers?

Make sure your firewall and anti-virus programs (on the XP) aren't preventing you from copying. From the Win 7 machine, you also, may have to 'take ownership'

I got it figured out. I'm new to the "permission" process.
Right Click the share folder > Share With... > Advanced Sharing > On the Sharing Tab - click Advanced Sharing > Click Permissions > Change Permissions for Everyone to Full Control. Apply > OK > OK > Close.

Now what I'd like is a short concise tutorial to explain the difference between "Full Control" - "Change" - ("Read" is obvious).