Command-Option-Shift-T is the Mac version of the Windows command Control-Alt-Shift-T. In general the Mac uses the Command key where Windows uses the Control key.
Yes you just have to have the correct version of Photoshop for a Mac.
Photoshop files use the extension .psd in Mac OS X.
yes
no. you have to get the mac version of photoshop
Command + Q.
Go to the Adobe site. They sell all of their design products (photoshop, dreamweaver, etc) for mac os as well.
Adobe photoshop
NO and don't try
Adobe Photoshop version 7 was the first version for Mac OS X and was released in 2002.
NO you need Mac version of Photoshop Elements.
regularly NO
yes.