[Sidefx-houdini-list] setting global variables

[Jerry Corda-Stanley]

Hi

I'm trying to do setenv RFEND = 240 but I keep getting complaints
of "Invalid variable name (RFEND)".
Seems Houdini won't let me mess with non-user defined variables.

Eh? Am I nuts. I'm suer I did this before.

How do I change the frame range using hscript. 

Cheers Jerry