On photoshop you have a huge range of photo editing function from the simple things like red eye reduction and cropping and resizing to adding special effects.
You can cut pictures into shapes on the computer by using Photoshop. Use the "crop" and "trim" functions in Photoshop.
Type Tool is how you type letters, numbers, symbols, etc into a Photoshop document. Side note: Photoshop 7.0 is 11 years old.
To move from Photoshop 7 to CS4 will require a purchased full copy of Photoshop CS4 as there is no upgrade available for versions of Photoshop older than 8 - the first CS version.
There are lots of photoshop training software packages and online training tutorials. Two sites I recommend are vtc.com and scottkelby.com. There is photoshop training available. Lynda.com offers the best training for the price.
Yes there are several programs available. Photoshop can be used everywhere.
Free trials of Photoshop can be found on their parent company's website. Adobe is the creator of this software. Trial versions usually have limited abilities.
There are a lot of tutorials on Photoshop available online. You can choose to learn directly from Adobe.com. They have a tutorial on learning Photoshop on their website. Lynda.com also has tutorials on Photoshop and other software or programs you might be interested in.
There are Adobe Photoshop training classes available on the official website, these classes teach you how to get the most out of your Adobe Photoshop. There are also no class fees.
There is 9th version already available.
It is not possible. Every version of Photoshop have system requirements in which falls and Operating System. Windows 7 wasn't available when Photoshop 4.0 is published so it does not meets requirements to install Photoshop 4.0.
Adobe's Photoshop for Macs is available from any software retailer. You can download a trial version directly from Adobe. (See links below)
Portable version is not supported by Adobe, there isn't portable version available, you should think about using portable Photoshop.