Abstract:  Tioga is a system to help you prepare documents.  Its two main components are an editor and a typesetter.  The editor 
lets you prepare the textual content of a document.  The typesetter composes the document into pages for printing.  Tioga is 
capable of dealing with simple technical papers and memos, and is well integrated within Cedar to support more mundane tasks such 
as writing programs.  In future versions, it will be suitable for complex technical documents and books and will support tables, 
math formulas, and illustrations containing synthetic graphics and scanned images.
Created by: Bill Paxton
XEROX            Xerox Corporation
                Palo Alto Research Center
                3333 Coyote Hill Road
                Palo Alto, California 94304

For Internal Xerox Use Only

User Categories
    The Tioga user-interface is `layered' so that beginning users can protect themselves from the confusion that results from 
    mistakenly giving a command.  In ways described below, you can tell the system that you are either a beginner, an intermediate, 
    or an advanced user.  In the current Cedar environment, the default is advanced, so beware.
    As far as the Tioga user-interface is concerned, the user category determines which keyboard commands are currently enabled.  As a 
    beginner, you get the commands that use the special keys at the left and right of the keyboard, plus CTRL-A and CTRL-W for 
    backspace character and word, respectively.  As an intermediate user, you add a large number of commands that use print keys in 
    combination with the various shift keys.  As an advanced user, you add the keyboard commands for manipulating the document tree 
    structure.  Any category of user can get at any of the commands by using the EditTool.  The user category mechanism is meant to 
    let you protect yourself, not to limit you.  The default user category in the user profile distributed with Cedar is Advanced.  
    You are free to change your own category at any time you feel like it.  For example, to declare yourself to be an intermediate 
    user, edit your user profile file to say UserCategory: Intermediate.
Selections
    The details of making selections will be covered later on.  For now, you simply need to know that there is a single primary 
    selection on the screen.  The viewer containing the selection is referred to as the selected viewer.  Many of the following 
    commands deal with the selection or the selected viewer. 
Find  find another instance of the selected text.
    In this command and the following two, the direction of search and capitalization are determined by the mouse buttons and SHIFT 
    keys.  LEFT-clicking searches forward from the current selection point; RIGHT-clicking searches backwards; MIDDLE-clicking does 
    a wrap-around search by first searching forward to the end of the document then searching from the beginning until the entire 
    document has been searched.  By default, the search matches capitalization.  Clicking with the SHIFT key down invokes a 
    `caseless' search in which capitalization does not matter.
    Use the command ReadTiogaTipTables to reload a TIP table after you've changed it, or, if your user category is advanced, hit CTRL-! 
    (really CTRL-SHIFT-1) to reload the Tioga profile information.
Insertion point
    The insertion point goes with primary selection.  It is shown by a blinking `caret' at one end or the other of the selection  the 
    end closer to the cursor when the selection was made or the end most recently extended.
    If the selected name is of the form <alpha>.<beta> and such a file exists, it is opened.  Otherwise, if <beta> is one of the 
    standard set of extensions, you will be informed that the file doesn't exist.  However, if <beta> is not a standard extension, 
    the system tries to open the file as if you had simply selected <alpha>.  If this succeeds, it searches in the file for a 
    definition of <beta> (see Def in the Places menu).  This convention is intended for use with programs that have many instances 
    of <Interface>.<Item> in which <Interface>.mesa is a file containing a definition for <Item>.