OK,

Here is a kix script:

 Code:
? $pa


and here is my first attempt:

 Code:
runnas.exe /user:bob 'kix32.exe s.kix $pa="spider web"'


results in:

 Code:
RUNNAS: The system cannot find the file specified.


So I try:

 Code:
runnas.exe /user:bob "kix32.exe s.kix $pa='spider web'"


results in the kix script saying:

 Code:
'spider


and then an error something like:

 Code:
Error: Failed to find/open script: web'