At the top menu, click Window>Tools. A tool bar should pop up.
A mirror image can be obtained by flipping the image horizontal. All software tools (from Paint to Photoshop) support it.
Go on http://www.photoshoplab.com/photoshop-tool-basics.html and it tells you all the tools meanings (:
photoshop
The answer you are most likely looking for is Tools, if you are referring to the icons from the Tools pallate on the left side of Photoshop.
You can't. You need brushes photoshop 7 brushes for photoshop 7.0
Photoshop is more advanced and has more tools.
No
In Photoshop go to File > Automate > Photomerge, from Adobe Bridge go to Tools > Photoshop > Photomerge.
It is question for Photoshop and Illustrator developers, which tool is from which app but Illustrator have Photoshop raster filters, that's for sure.
Selections tools inside Adobe Photoshop are : Lasso tools, Marquee tools, Magic Wand and Quick Selection, Color Range from Select menu and you can also trace edges with Pen Tool or Magnetic Pen Tool which is accessible when Freeform Pen Tool is active.
Yes you can, Photoshop 64 bit have exactly same options and tools as Photoshop 32 bit.
Yes, Windows 7 can run all versions of Photoshop