Starting a 16-bit app in its own memory space

[Bannerman]

I want to load a 16-bit application (exe) from VB5 (with windows NT) and I want the application to run in its own memory space (Virtual Dos Machine, VDM) rather than in the VDM which, by default, is used for all 16-bit apps. I've looked at the CREATEPROCESS API and it looks as if I can achieve this by setting one of the dwcreationflags to CREATE_SEPARATE_WOW_VDM. But if I do this what do I set the lpEnvironment parameter to as if it is null "the new process uses the environement of the calling process". (What is an environment block?).

Specifically, the app is a 16-bit version of Lotus 1-2-3 (release 5). If this is run from a shortcut there is a checkbox which allows a copy to run in its own memory space. But I don't know how to achieve the same thing from VB5. (There may be a way of doing this using SHELL or SHELLEXECUTE).

Any help appreciated, especially any code example.
Thanks.