The entire ORCHIS manual is available for on-line viewing via the indexed HELP system. At any time, when you are using ORCHIS, you can press F1 to activate HELP. A new screen layout is then created containing four windows: a prompt window, a menu window, a graphic window and a document window. The document window displays a portion of the ORCHIS manual text. If there is an illustration accompanying the displayed text, it will appear in the graphic window. See the illustration <[FIG13]>. The HELP system is context sensitive. The portion of the document initially displayed depends on the state of ORCHIS when HELP is invoked. ORCHIS attempts to display the portion of the document relevant to your current operation. The choice depends on the current menu being displayed and on the last command executed. While the HELP system is active, the NumPad keys on the keyboard are detached from the cursor. (The cursor can only be moved via the mouse). Instead the NumPad keys control the text displayed in the document window. The up arrow (or left arrow) moves the displayed text backwards one line. The down arrow (or right arrow) moves the displayed text forward one line. PGUP and PGDN move the text display backwards or forwards one page. HOME and END position the text at the start and end of the current chapter, respectively. When the discussion at one place in the document refers to information located in a different section, there will often be a cross-reference mark in the HELP display at that place. This mark consists of a section number in square brackets displayed in red. If you have a mouse, you can access the referenced section by positioning the cursor on the cross-reference mark and pressing the left mouse button. This is called clicking on the reference. If you do not have a mouse, you can use the GOTO command <[11.8]> described below to display the new section. Illustrations appear in the document text as figure references. These are highlighted strings of the form "FIGxx" appearing in square brackets, where "xx" is the figure number. You can click on a figure reference to display that figure temporarily in the document window, pressing ESC when you want to restore the normal document display. The same operation can be performed with the ZOOM command <[11.9]> described below.

The UP command moves the document display backwards to display the previous page of document text. The same function can be invoked by pressing the page up key, PGUP. This command only moves within the currently displayed chapter. To move to another chapter use the GOTO command <[11.8]> described below.

The TOP command moves the document display to the top of the current chapter. The same function can be invoked by pressing the HOME key.

The DOWN command moves the document display forwards to display the following page of document text. The same function can be invoked by pressing the page down key, PGDN. This command only moves within the currently displayed chapter. To move to another chapter use the GOTO command <[11.8]> described below.

The BOTTOM command moves the document display to the bottom of the current chapter. The same function can be invoked by pressing the END key.

The CONTENTS command displays the table of contents of the ORCHIS manual. There is one entry for each section of the manual. Each entry includes the section number and the section title. The HELP system treats the table of contents like any other chapter of the document. All of the HELP commands (UP, DOWN, SEARCH, REPEAT, etc.) are equally applicable to the table of contents. When you have located the section that you wish to consult, simply click on its section number in the table of contents to go to that section of the document. You can also use the GOTO command <[11.8]> described below to display that section.

With the SEARCH command you can search the current chapter (or table of contents) for the first occurrence of a given word. The search begins at the top of the current chapter. The search ignores the distinction between upper and lower case; either case of a letter counts as a match for that letter. If you want to find additional occurrences of the same word use the REPEAT command <[11.7]> described below. To operate the SEARCH command press the command letter, type in the word you want to search for and press ENTER. ORCHIS will locate the first occurrence of the string you typed, and will display it highlighted in red in the document window. The SEARCH command is particularly useful for searching the table of contents to find the sections referring to a particular topic. See the CONTENTS command <[11.5]> described above.

After you have used the SEARCH command <[11.6]> to find the first occurrence of a given word, you can use the REPEAT command to find subsequent occurrences of the same word within the current chapter. Press the command letter to locate the second occurrence. Continue pressing the command letter to find the third and subsequent occurrences.

To display a particular chapter or section in the document window use the GOTO command. Press the command letter, then type in the desired section number and press ENTER. The designated section will be displayed in the document window. Section numbers consist of one, two, or three numbers separated by periods. For example, 10, 10.2, and 10.2.4 are possible sections numbers. The first number is the chapter number; the second is the section number and the third the sub-section number. To find the section number of the section that you want to consult, use the CONTENTS command <[11.5]> to display the table of contents of the manual.

The ZOOM command temporarily replaces the document window display with a magnified copy of the illustration displayed in the graphics window. Press the command letter a second time (or press ESC) to restore the document text display.