[JDEV] Problem to block a user

[German Pablo de la Cruz]

Hi everybody!   I have a problem with this. I want to implement a service in my client to block a user like MSN messenger. I see that a lot of client use the type unavailable from presence command tod o that. But, if I close the client and I start it again, the block is gone (Because it sends an available to everybody)   Then I try to put in the client a internal list and I send unavailable to everybody, but I see a phenomenon in the oder side. The other side see that my client gono online and the offline (like a flash)   There are a more clean way to do that?   Thanks!