How to link help context-sensitive with application?

You do link help context-sensitive with application inside of its configuration (*.pageconf file). Inside 'page' xml root will present a 'processor' xml element. For static security code, you define a HelpContext attribute to do. Other, you create HelpContext element inside PageSecurityCode element under 'processor' xml element.

See below for your example:

<?xml version="1.0" encoding="UTF-8"?>
 <page name="NestMaint" id="NestMaint" >
  <processor PageSecurityCode="Page|NestMaint" HelpContext="LIGHTARMY-Applications.NestConfig" sOnlyTemplateFileName="NestMaint.html" CanPublic="false">
   
   <PageSecurityCode>
    <Name>Nest Maintenance</Name>
    <Description></Description>
    <HelpContext>LIGHTARMY-Applications.NestConfig</HelpContext>
   </PageSecurityCode>
   
   <PageActionSelectionScript><![CDATA[
    switch ((string)GetCurrentPageConfig('sForm')) {
    case 'NestMaint':
     CIISONLINE_NestMaint::NestMaintAction(GetCurrentPageConfig('sAction'));
    }
   ]]></PageActionSelectionScript>
   <TemplateProcessingScript><![CDATA[
    CIISONLINE_Header::Menu_Show();
    CIISONLINE_Footer::FooterForm_Show();
    CIISONLINE_NestMaint::MenuPath_Show();
    CIISONLINE_NestMaint::NestMaint_Show();
   ]]></TemplateProcessingScript>
   <ResponseProcessingScript><![CDATA[
    ResponseWrite (PrintVar('main'));
   ]]></ResponseProcessingScript>
   <IncludeFile>PageClass/Header.php</IncludeFile>
   <IncludeFile>PageClass/Footer.php</IncludeFile>
   <IncludeFile>PageClass/NestMaint.php</IncludeFile>
   
   <TemplateSpaceHolder name="Header">Header.html</TemplateSpaceHolder>
   <TemplateSpaceHolder name="Footer">Footer.html</TemplateSpaceHolder>
   <TemplateSpaceHolder name="Space01">Space01.html</TemplateSpaceHolder>
   <TemplateSpaceHolder name="Space02">Space02.html</TemplateSpaceHolder>
   <TemplateSpaceHolder name="Space03">Space03.html</TemplateSpaceHolder>
   <TemplateSpaceHolder name="Space04">Space04.html</TemplateSpaceHolder>
   <TemplateSpaceHolder name="Space05">Space05.html</TemplateSpaceHolder>
   <TemplateSpaceHolder name="Space06">Space06.html</TemplateSpaceHolder>
   <TemplateSpaceHolder name="Space07">Space07.html</TemplateSpaceHolder>
   <TemplateSpaceHolder name="Space08">Space08.html</TemplateSpaceHolder>
   <TemplateSpaceHolder name="Space09">Space09.html</TemplateSpaceHolder>
   <TemplateSpaceHolder name="Space10">Space10.html</TemplateSpaceHolder>
   
  </processor>
 </page>