How to connect Remote Desktop from WAN to LAN w/Users?

[zynizen]

I'm trying to figure out how I can use remote desktop to connect from my home office to a couple clients, that have LAN's with multiple mac's.

Let's say at Company A, there is 10 employees that run macs, and 4 of them are having problems today of some sort. How can I configure this setup to allow my remote desktop application on my iMac to administer all 10 employees in that LAN ?

on the Airport Extreme it won't allow me to enter more remote desktop port forwards. I've configured AirPort Extreme to allow remote desktop to pass through to one of the internal LAN ip's: 192.168.1.5, if I choose the + sign I can't add more.

on a different router, I would assume you can forward the same ports to multiple internal machines, but, then when i type "companyA.dyndns.org" it only still finds one.

Is this possible or am I asking for too much? How do others manage LAN users remotely?

Thanks