Debugging Multiple Processes

Hi all,

Can anyone shed any light on this? I'm trying to patch Sonic 3D (when I try to install it from the CD, it tells me I need at least 5 MB free disk space - I actually have about 12 GB free). I'm using W32Dasm. When you (try to) install Sonic 3D, you run D:setup.exe which then calls D:DIRECTXsetup.exe.... The part I need to patch is in D:DIRECTXsetup.exe, but this seems to use some DLLs that are loaded in D:setup.exe, so D:DIRECTXsetup.exe cannot be run without D:setup.exe.

If you're still with me, my question is: How do I load one process which calls another process and then debug/patch this second process???

Or any other ideas regarding this problem would be appreciated.

Thanks in advance,

narnar2000.