Question: I've got a Windows 2003 Active Directory infrastructure, and there are times (such as when terminating an employee) that I want instantaneous propagation across both of my AD servers. Currently, I make the change in both places, which I suspect is unhealthy, but it's the only way I know to make sure that the account is disabled to every machine. 

Is there a better way? Do I have to wait for the normal propagation time for convergence, or is there a way to "force" it?

Answer: 
There is an even easier change. Just reset the users password. That is one of the few instant replications that AD performs. No need to run site replication

EDIT:

Small edit. It's not completely instant. What is does is forward the change in an out-of-band update. (It doesn't wait for normal replication cycles)

however, it's probably about as close to instant that you can get with AD.
Remember when you play with forcing replication, all replication links are **one-way, incoming**. If you want to *push* changes outbound from a DC via the Sites & Services console, you have to go to each replica-partner and ***PULL*** from the source DC.

There is an easier way to force "outbound-full-replication" using the [repadmin.exe](http://technet.microsoft.com/en-us/library/cc755360(WS.10).aspx?ppud=4) tool from the [Windows 2003 SP1 Support Tools](http://support.microsoft.com/kb/892777) kit:

```
repadmin /syncall /P /e sourceDC1.domain.local

```

This will push the changes via all replication links, outward from your source DC, for the default naming contaxt (which is where your user data is).