Chunk VNC test:
I prefer using UltraVNC (it only creates a single Registry Key + Empty folder in %APPDATA%) or if you are looking for a TeamViewer like application for both Free for Commercial and Personal use checkout ChunkVNC
This is an incomplete test in WinXP SP2. Its incomplete because I couldn't get a VNC server software to work on the network.
Far from stealth but might still qualify as portable.
- Extract, move files from /viewer/bin to a folder of your choice, delete other files (actual program and settings are only ~1.3 megs.)
- Run VNCViewer.exe
Creates empty folder in appdata
Writes some minor settings to the registry
Unfortunately, it also saves the last server attempt to the registry, which is possible a privacy issue: