Combining ISO Images

[Whizbang]

Sun twisted my arm about using Solaris 10, so I decided to try another installation of same.  The first one was a dud because of file corruption.  Since I had to download on Direcway previously that had maximum download restrictions, it was a real ordeal to get it all over several days of segmented downloads.  Now, I have got a fresh batch of three and cannot get the ISO images to combine.  I am using Nero as the burning program.  The problem is that the three files are separate ISO image segments that must be recombined in a single bootable DVD.

sol-nv-b70b-x86-dvd-iso-a
sol-nv-b70b-x86-dvd-iso-b
sol-nv-b70b-x86-dvd-iso-c

I have tried getting to the help page on Sun, but the sign-in procedure is so complex that I am having to retrace the steps I took to get the information that I need.  It has not been easy to do.

The addendums "a," 'b," and "c" confuse Nero.  I am wondering if I need to use Nero Burning ROM application and choose the Bootable DVD option instead.  Any takers here?  I hate making more DVD coasters.