Three Linux Operating Systems in One Computer (Is it possible?)

Hello there,
First, I must thank all of you for paying attention for this matter and posting your comments. Please read the following,
Hard disk map of my PC is listed below:


Hard Disk 1 19.42GiB IDE
/dev/hda1 Extended-3 / 6.11GiB Primary Boot
/dev/hda7 Memory swap 1.10GiB Logical
/dev/hda6 Extended-3 /edubuntu 6.11GiB Logical
/dev/hda5 Extended-3 /redhat 6.11GiB Logical


Hard Disk 2 76.69GiB SATA
/dev/sda1 Windows NTFS /media/sda1 14.75GiB Primary Boot
/dev/sda5 Windows NTFS /media/sda5 16.70GiB Logical
/dev/sda6 Windows NTFS /media/sda6 16.70GiB Logical
/dev/sda7 Windows NTFS /media/sda7 16.70GiB Logical
/dev/sda8 Windows NTFS /media/sda8 11.84GiB Logical


The GRUB boot loader is installed on the first hard disk. If the first hard disk is disabled from the CMOS setup, system boots up with the second hard disk. (but no need to disable ? GRUB takes all)
I use Linux for educational and online purposes of my daily life. Education is the reason for the interest of three Linux operating systems. Although I am new to Linux, I need to learn them all.
I am planning to combine /dev/hda6 with /devhda1 using the Gnome Partition Editor and then 'apt-get' Edubuntu desktop as Felix Miata told.
I have following questions:

1. Am I on the right track?
2. What is the URI for Edubuntu desktop? And how about the download size?
3. Can I install Edubuntu desktop from the Edubuntu CD-ROM?
4. Is it enough only a one swap partition for all Linux operating systems? (shared swap) or may I have to break the swap into two partitions?
5. If the swap is not fully deactivated when shutting down one Linux operating system (say due to a power failure), would it it affect any second Linux OS during the second one's boot?
6. What are the steps I should follow next?
7. After all installations, will I have to edit the GRUB to make Ubuntu default?
8. Would this confuse the existing Ubuntu kernel?


So, what do you think? What are your guesses? Is it a possible way which I am planning?


Thanks.
Regarding,

* Sameera Shaakunthala.
shaakunthala@xxxxxxxxx
shaakunthala@xxxxxxxxxxx

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