Run ISO from alternate HDD partition or install.

I am pretty sure I read something on this a while back but I cannot find the topic and I don't remember the details. 

I have a Windows 7 computer that I want to add an alternate partition to and run the win7PE SE project from.  Either installed or as a Live ISO, that detail does not matter.  The idea here is to give a field tech an alternate OS to work in and also allow them an environment to capture and apply backups of the production OS with ImageX.

For bios system, you could just put the iso on another partition and it to the boot menu with easybcd.

For Efi system, put boot.wim on another partition and add it as a wim entry using easybcd.