Hello,
PartyPoker has been taking a stance on HUDs in recent years. Most of the PartyPoker rooms that still allow HUDs also have imposed some restrictions on them. This changes from site to site and it is suggested to question the specific site for the updated rules.
About the composite definitions:
Have a look here:
http://notecaddy.com/Composite-Definitions.ashxYou can use composite definitions to combine definitions or to create stats based on the expressions you use. These can still be usefull, if restricted by the poker room, for review sessions and take advanced notes on opponents.
Regards,
nokaspokas