VPN Connections and DNS configurations

["pedro hrfpeixoto gmail com" <pedro hrfpeixoto gmail com>]

Hi there,

I'd like to know if theres is a way to manualy enter DNS server names 
and domains when using M$ PPTP and OpenVPN connections under Network 
Manager.

Can i do that editing each connections configuration file? where are 
theese files located?

Thanks in advance