[PyMOL] Ca-only and multi-mol PDB

[Anastassis P. (N. <a.p...@nk...>]

Dear Warren et al,

A couple of questions about PyMol:

When I open a multi-molecule PDB file, it nicely stores every 
'instance' of the PDB in a frame.
This file is coming from the 'Dynamite' server of Martin Noble and has 
only Ca's.

I have two problems:
1. How do I make a cartoon passing through Ca's ? It refuses to do that 
with default values like for a 'full' PDB file !
2. I want to include another single molecule and have frames where the 
second molecules 'stays the same'
while the first one changes in each frame. Is that easy to do ? Anyone 
has a script ?

Thanks in advance,

Tassos