[Samba] Samba 3.0.2 "net join" questions

[Chu, Dan]

1. What is the right procedure for a Samba 3.x server to join multiple domains? I have seen below error intermittently when using "net join":

Create of workstation account failed
User specified does not have administrator privileges
Unable to join domain <domain_name>.

2. Is there a Samba (v3.0.2) command to show what domain(s) it has already joined? 

Thanks in advance.