\hy-10{100}{Hypertext - format markers:}
    
    \hy-2{200}{Coloured text}
    
    \hy-2{201}{Headings and Sections}
    
    \hy-2{202}{Typefaces}

    \hy-2{203}{General formatting info}

    \hy-10{210}{Coloured text}

    \hy-1{117}{The format marker for \hy-2{1}{red text} is \hy-8{1}{\hy-2}}

    \hy-1{118}{The format marker for \hy-3{1}{blue text} is \hy-8{1}{\hy-3}}

    \hy-1{119}{The format marker for \hy-4{1}{green text} is \hy-8{1}{\hy-4}}

    \hy-1{120}{See also: \hy-2{121}{Headings and Sections}    \hy-2{122}{Typefaces}

    \hy-10{220}{Headings and Sections}

    \hy-1{106}{The format marker for a \hy-8{1}{large heading} is \hy-8{1}{\hy-5}}
    A large heading is boldface and aobut three times as big as normal text.

    \hy-1{107}{The format marker for a \hy-8{1}{small heading} is \hy-8{1}{\hy-6}}
    A small heading is boldface and about twice as big as normal text.

    \hy-1{108}{The format marker for a \hy-8{1}{large visible section} is \hy-8{1}{\hy-10}}
    A large visible section is a new section which will be visible in the index. It
    is headed by a large heading.
    
    \hy-1{109}{The format marker for a \hy-8{1}{small visible section} is \hy-8{1}{\hy-11}}
    A small visible section is a new section which will be visible in the index. It
    is headed by a small heading.

    \hy-1{110}{The format marker for an \hy-8{1}{invisible section} is \hy-8{1}{\hy-9}}
    An invisible section is a new section that will not be visible in the index. It
    is headed in red, normal text.

    \hy-1{111}{See also: \hy-2{123}{Coloured text}    \hy-2{124}{Typefaces}

    \hy-10{230}{Typefaces}

    \hy-1{125}{The format marker for text in \hy-7{1}{italics} is \hy-8{1}{\hy-7}}

    \hy-1{126}{The format marker for text in \hy-13{1}{red italics} is \hy-8{1}{\hy-13}}

    \hy-1{124}{The format marker for text in \hy-8{1}{boldface} is \hy-8{1}{\hy-8}}

    \hy-1{127}{The format marker for \hy-12{1}{small text} is \hy-8{1}{\hy-12}}

    \hy-1{130}{The format marker for \hy-14{1}{verbatim text} is \hy-8{1}{\hy-14}}

    \hy-1{111}{See also: \hy-2{131}{Coloured text}    \hy-2{132}{Headings and Sections}

    \hy-10{240}{General formatting info}

    A Hypertext document is a plain ASCII file with formatting instructions in the
    text. The formatting instructions are written on the syntax
  
                 \hy-14{1}{\hy-\hy-7{1}{xx}{\hy-7{1}{blocknum}}{\hy-7{1}{text}}}

    where
    - \hy-7{1}{xx} is the specific format marker used
    - \hy-7{1}{blocknum} is the number of the actual block
    - \hy-7{1}{text} is the text to be shown using the actual format
         
    In the end of the document one can place a paragraph on the syntax
  
                 \hy-14{1}{\hyindex {
        \hy-7{1}{"window caption"}
        \hy-7{1}{blocknr blocknr}
        \hy-7{1}{blocknr blocknr}
        .
        .
        }}
     
    to set the window caption and link the blocks that should be linked.

\hyindex{ 
"Test helpfile" 
200 210
201 220
202 230
203 240
121 220
122 230
123 210
124 230
131 210
132 220
}
