With my non-admin account on WINXP SP3 I tried "\\NoSuchComputer\c$" and "\\PingableButSecureComputer\c$" and both of these failed, the first after an extended period of time (would be nice if the app pinged it first), the second quickly. No error messages were displayed. No prompts for credentials.
Just to clarify it its needed (I just started using the app) I am typing this into the Address Tab's field. Is there any logging I can turn on? I tried to turn on the "logging" core setting, but if its logging i don't know where, tried looking for a log file in "%TEMP%" as well as the app tree.