Learn questions about Red Hat Enterprise RHEL6.4

(1) After Reading RHEL 6.4 for one night, I still haven't understood the server version and desktop version.
Both versions are a single file. How can I determine whether the server version or desktop version is used after installation?
Some people say that they will require selection during the installation process. I have no choice for Virtual Machine installation?
It is said that the desktop version has a desktop, and the server version has no desktop in command mode, but the _ server mark is included in my ios file. After installation, it also has a desktop?
How can I determine the version of RHEL 6.4 I have installed? Also, how do I select ios files?

(2) about Installation
Is it true that all linux releases support three types of installation: CD installation, USB flash disk installation, and command line installation?
Installing RHEL 6.4 on a virtual machine is a bunch of commands that are black and automatically executed. I entered the password throughout the process. Is this also called "uninstalling "?
I don't need to partition when I use a virtual machine to install Linux? Do not need to do any configuration? How can I see that other people's tutorials use various configurations?

I hope new Veterans can give me more information!