Help and info

It is of course important that an operator quickly and easily can get help on how to handle
graphs and processes. One way to solve this is to create help and info buttons in the graph.
You can, for example, use the subgraphs ButtonHelp or ButtonInfo. The action type for those are
Help, and you supply a topic in Help.Topic, and any bookmark in Help.Bookmark. The help
function fetches help text written in the file $pwrp_cnf/xtt_help.dat, and a bookmark makes
it possible to position in a specific row of the text.