Multiple Instance Setups

Hi all,
I want to know how will I implement multiple instance setups behave differently and treated as different installers? I want based on a particular GUID all the binaries are redirected to different directories and have different registry entries.
How can I implement this in my NSIS script?
Can anybody help me in this regard?

I have seen the similar implementation in other installers based on GUID as mentioned below:



[Snippet from above link]
Specifies the value of the system variable INSTANCE_GUID; for example, -ig{722C7440-B317-4B3B-AECA-0199EA4E7CDB}. If this option is not used, the setup automatically assigns a value to INSTANCE_GUID (for multi-instance setups, this value is a newly generated GUID; for standard setups, this value is the same as the value of PRODUCT_GUID).

Regards
Pradeep