Does anyone know what the default mode is ?Single mode or multimodeIs this a permanent settings or can I change the mode settings?

Can any one point me to the right documentation on How to configure DLSW on two redundant 6509 switches.

I am looking for the best practice configuration for Firewalls with Citrix MetaFrameXP.Any ideas, comments, suggestions , please feel free to reply back.Thanks in advance for helping out.