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Enters the HELP system to obtain help on the specified topic. If the topic is omitted, the HELP system will display a list of possible topics, then prompt for one of them. On the DEC-20, the portable help system may be replaced by the tree-structured EMACS XINFO system, which will provide extremely fast screen-based editing access to this file (probably DOC:SLIDES.INFO), as well as to anything else in the XINFO tree. Besides being fast, XINFO allows scanning forward and backward in each node and permits keyword and string searches. Typing a query inside XINFO will get you help on how to use it, and typing a Q (for Quit) will get you back to SLIDES.