Some graphical applications, including most of those supported by Starlink, require a PseudoColor visual for their display, and some X displays, especially on newer Linux machines running with many colours, only provide TrueColor visuals. Thus, trying to run one of these programs on some X displays will cause the program to display badly, or fail to run.
This document describes one way of getting round this problem. If you want to take advantage of it, the only part you need to read is section 3.1. The rest of the document gives some technical background and advice on modifying the procedure.
Much more detailed information on all these topics, and the VNC software itself, can be found at the VNC web site, http://www.orl.co.uk/vnc/.
Using VNC to display Starlink graphics applications