All pages rendered on the system use UDB commands to insert different elements on to the page.
For example, if you want to put the page title onto a template then you can insert the command {PAGE_TITLE}. This will be replaced with the current page title whatever page is being displayed.
If you want to add a link to a another page on the system then you can add {LINK(1013, Contact)}. This will create a link to the page number 1013 and add the text "Contact" (Contact).

All of the commands need to be enclosed in { } when used on the page and the command needs to be entered in upper case. They may also have parameters. These are enclosed in ( ). Most of the time it is easier to enter the parameters by position separated by commas. So in the LINK example above, the first parameter is the Object ID of the page you want to link to and the second parameter is the text you want to be displayed on the page. Sometimes there may be a larger number of parameter options and using lots of commas to get to the correct parameter can be awkward and confusing to read. In this case, you can use a JSON list of parameters. So for the example above, you can use {LINK(1013, {"text":"Contact","class":"btn btn-primary"})}. The JSON list of parameters can only be used as the last parameter. A list of all the parameters are detailed in the command help.

You can also pass in an array of parameters using an array variable. To do this add a JSON parameter "param_array":"V_ARRAY". All the values in the V_ARRAY variable will be used as parameters.

When adding an Object ID as a parameter, it is a good idea to precede it with "#:". This helps the system to identify the number as an Object ID. This is essential if you are writing an application to be shared by other organisations as the Object IDs will need to be changed by the system when they import your application. So the example above, should be written {LINK(#:1013, Contact)}. See OBJ_ID for more info.

If a parameter includes a comma it must be quoted {LINK(1013, "Contact John Doe or, a member of the team")}. If the parameter includes quotes and commas, quotes are escaped with another quote {LINK(1013, "Contact John ""The Man"" Doe or, a member of the team")}. 

Parameter values are individually interpreted before they are passed to the command for processing. This can be prevented by preceeding the parameter value with two exclamation marks!!

See below for a full list of commands and their explanations.

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Tag Description Structure
ACCORDION Add Bootstrap Accordion to the Page {ACCORDION(query, sub_temp_query)}
AJAX_EMBED Embed the contents on to the page using AJAX {AJAX_EMBED(obj_id, param)}
BASIC_DISP Return the Basic Display format specified in the objects list setup. {BASIC_DISP}
BLINK Add a button to the page to Link to another page. {BLINK(obj_id, text, param)}
CALENDAR Displays a Calendar or Diary of events {CALENDAR(obj_id, date_mode, query, relobj)}
COMMENT This will create an area for users to enter comments. {COMMENT(obj_id, options, login-text)}
EMBED Embed an object in the page {EMBED(obj_id, sub_temp, minutes, mode)}
FAVICON Specify the url of the favicon to be used on the site {FAVICON(url)}
GLINK Glossary Link {GLINK(obj_id, text, sub_temp)}
GLINK_OFF Turn Glossary Links Off {GLINK_OFF}
GLINK_ON Turn Glossary Links back on again {GLINK_ON}
GOOGLE_CHART_BTN Add a google chart to the page {GOOGLE_CHART_BTN(table id, div id, chart type)}
LABEL Specify a Form Label {LABEL(desc, id)}
LINK Create a link to another Object {LINK(obj_id, text, param)}
LIST List Processing {LIST(root, rel_id, list_id, query, temp_id, disp_opt, page_size)}
LIST_NAV List Navigation {LIST_NAV}
LOGIN Provide a Login Prompt with associated menu options once logged in {LOGIN(options)}
LOGIN_FACEBOOK Allow users to login with their Facebook account {LOGIN_FACEBOOK(auto_login, text)}
LOGIN_FORM Start a Login Form {LOGIN_FORM(error_div_id, class, style)}
LOGIN_LINK Add a Login prompt to the page {LOGIN_LINK(text, form_object_id)}
LOGIN_NAME Display the Login Name Input Box on a Login Form {LOGIN_NAME(tooltip, placeholder, class, style)}
LOGIN_PASSWORD Display The password Input Box on a Login Form {LOGIN_PASSWORD(tooltip, placeholder)}
LOGIN_REM_ME Remember me checkbox on a Login Form {LOGIN_REM_ME}
LOGIN_SUBMIT Submit Button for Login Form {LOGIN_SUBMIT(text, tooltip, class, style)}
MENU Add a menu to the page {MENU(root_id, options, collapse_text)}
NOTIFY Display a pop-up message for the user {NOTIFY(message, type_id, position, duration, min_user_level)}
PAGE_TITLE Display the page title {PAGE_TITLE}
PANEL Add a fixed Panel to the page {PANEL(heading)}
PANEL_CLOSED Add a closed Panel to the page. {PANEL_CLOSED(heading)}
PANEL_OPEN Add an open panel to the page. {PANEL_OPEN(heading)}
PILLS Add Bootstrap Pill Selector {PILLS(query, sub_temp_query)}
PRINT_BUTTON Displays a button that prints the current page {PRINT_BUTTON}
REGISTER Registration Link {REGISTER(text, class)}
RENDER_TREE Render a tree structure of Objects {RENDER_TREE(obj_id, rel_id, sub_temp, options)}
SEQN An automatically incrementing Sequence Number {SEQN}
SET_PAGE_TITLE Set the page Title to overide the default {SET_PAGE_TITLE(title)}
SIDEBAR_LEFT/RIGHT Set the object to be displayed in the left or right sidebar. {SIDEBAR_LEFT(obj_id)}
SLIDES Add Bootstrap Slides to the Page. {SLIDES(query, sub_temp_query)}
SYMBOL Returns a symbol of the specified ID {SYMBOL(symb_id)}
TAB Add a Tab to a TABS, PILLS or ACCORDION {TAB(text)}
TABS Add Bootstrap Tabs {TABS(query, sub_temp_query)}
WRAP Wrap the specified part of the page with a sub template {WRAP(obj_id)}
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Tag Description Structure
ABS Return the absolute(positive) value of the provided value. {ABS(val)}
ACCORDION Add Bootstrap Accordion to the Page {ACCORDION(query, sub_temp_query)}
ADD Add a numeric value to a variable {ADD(name, value)}
AGE Determine the age between two dates {AGE(format, date, date_format)}
AJAX_EMBED Embed the contents on to the page using AJAX {AJAX_EMBED(obj_id, param)}
ALPHA_INC Increase the value of an Alpha Numeric string {ALPHA_INC(val)}
API_CALL Make a call to a prepared API service {API_CALL(api_alias, result_alias, path, method, params)}
API_CLEAR_RESULT Clears an API result from memory {API_CLEAR_RESULT(result_alias)}
API_DATA Returns a data field from an API response {API_DATA(result_alias, data_field)}
API_DATA_TO_XML Converts one or more API resource fields to an XML string {API_DATA_TO_XML(result_alias, data_fields)}
API_FOR_EACH Itterates over items in an API result {API_FOR_EACH(result_alias, data_field, row_alias)}
API_HEADER_SET Adds an HTTP header to send with an API call {API_HEADER_SET(alias, name, value)}
API_HEADER_UNSET Unsets a previously set HTTP header, or all, for the API call. {API_HEADER_UNSET(alias, name)}
API_QTY Returns the number of elements in an API result {API_QTY(result_alias, data_field)}
API_SETUP Prepares for use of an API service {API_SETUP(api_alias, url, params, method, response)}
APP Append a string to the end of a variable. {APP(name, value, separator)}
ARRAY_CLEAR Clear the contents of an array {ARRAY_CLEAR(name)}
ARRAY_FOR_EACH Loop through all elements in an array {ARRAY_FOR_EACH(name, var)}
ARRAY_JOIN Join all the elements in an array using the specified character {ARRAY_JOIN(name, char)}
ARRAY_JSON Return an arrays content as a JSON string {ARRAY_JSON(name)}
ARRAY_QTY_IN Return the number of times a value occurs in an array {ARRAY_QTY_IN(name, string)}
ARRAY_SIZE Return the size of an array {ARRAY_SIZE(name)}
BACKGROUND_TASK Run a background task {BACKGROUND_TASK(obj_id, param)}
BASIC_DISP Return the Basic Display format specified in the objects list setup. {BASIC_DISP}
BETWEEN Return TRUE if the first value is between the second two values. {BETWEEN(check, from, to)}
BLINK Add a button to the page to Link to another page. {BLINK(obj_id, text, param)}
BSWAP Swap individual characters in a string {BSWAP(string, search, replace)}
CALENDAR Displays a Calendar or Diary of events {CALENDAR(obj_id, date_mode, query, relobj)}
CALL Call a predefined Function {CALL(name)}
CHAR Return a series of characters specified by their ascii value {CHAR(...)}
CHAT_SEND Send a Chat Message to another User {CHAT_SEND(user_id, text, level)}
CHAT_USERS Displays a list of Users for use in the Chat System. {CHAT_USERS(user_qty)}
CHOICE Display a checkbox that allows you to choose if other text is displayed. {CHOICE(obj_id, tag, class, target)}
CHOICES Displays a drop-down box on the page to allow for the selection of text to be inserted. {CHOICES(rel_id)}
CODE_LOOKUP Provide an input box and search button to lookup an object based on its ID, Code or Friendly Name {CODE_LOOKUP(list_id, part)}
COID Return the current Object ID {COID}
COMMA Returns a comma , {COMMA}
COMMENT This will create an area for users to enter comments. {COMMENT(obj_id, options, login-text)}
COMPARE Compare two values in a number of ways {COMPARE(value1, method, value2)}
COMPONENT Add one or more components to the current page. Use a list of IDs {COMPONENT(...)}
COOKIE_DEL Delete a cookie {COOKIE_DEL(name)}
COOKIE_GET Get the value of a cookie {COOKIE_GET(name, default)}
COOKIE_SET Set a cookie {COOKIE_SET(name, life, value)}
CRLF Returns Carriage return & Line Feed characters {CRLF}
CSV_DATA Get date from imported CSV {CSV_DATA(alias, column)}
CSV_DATA_TO_XML Convert the imported CSV data to XML {CSV_DATA_TO_XML(alias, data_fields)}
CSV_FOR_EACH Loop through all CsV data rows {CSV_FOR_EACH(alias)}
CSV_GET Get the contents of a CSV file. {CSV_GET(alias, url)}
DEV_MODE Return TRUE or FALSE for the current Development Mode {DEV_MODE}
DNAM Return the Domain Name {DNAM}