This depends on the distro that you are using. In many modern distros, you can use the ntfs-3g driver (often included) to mount Windows partitions. The partition will show up on the desktop. In some others, you will have to manually add an entry to the /etc/fstab file.
There are programs you can download that will read Linux file systems. Common file systems are ext2 and ext3.
Linux does not identify drives or partitions with letters. To Windows, "C:" is the partition that the running version of Windows is currently installed on, regardless of how many partitions are on the disk. Linux identifies partitions based on the order they are placed on the disk. For instance, the second partition on the first hard drive would be /dev/sda2 or /dev/hda2. In order to access a Windows partition,you will need to identify what partition it is actually on. A quick way to do this is to run cfdisk /dev/sda or cfdisk with whatever hard drive it is on if you have more than one. A Windows partition will have the type of either NTFS or FAT32. To mount it, create a directory (such as /mnt/windows), and use the command mount /dev/sda3 /mnt/windows substituting of course the correct partition.
you can partition the drive.. to use both OS
Yes. All that you need to do is shrink the Windows partition so your Linux partition can fit. Then just install the Linux OS into there, and you'll be able to choose which one to boot into on startup
Yes. To achieve this, you need to shrink the window partition so there is space for the Linux partition on the disk.
Yes. All you have to do is give Linux its own partition.
Some manufactures put a special partition for restoring purposes. It might happen that windows will not recognize that partition but it will still work with properly. Also if you have Linux on your system windows will not recognize too...
I suggest installing Windows, and then Linux (preferably on different physical hard drives). When Windows is installed it tends to overwrite the boot partition, making it difficult to boot linux afterwards.
Unless you already have a free partition on your hard drive or an additional hard drive, you cannot install Red Hat Enterprise Linux without "disturbing" Windows; you will need to resize the Windows partition to make room.
"Mounting" means to enable read / write access to a partition.
Yes. LiveCDs can access the hard drive on a computer, though you will need to know the partition identification to mount that partition.
Insert your Windows CD or DVD and get to the part where it shows all your partitions and delete the Linux partitions. If you are unsure which one is your windows partition just make sure you don't delete or format any partition that is in the NTFS, or in the rare case a FAT32 format, as those would be your windows partitions.