The main function to add to CMSimple is the very useful -
wrap($URL) - function.
Note: In CMSimple-XH, functions can be added as needed to the userfuncs.php file which is placed within the 'cmsimple' folder of your CMS installation.
wrap() is a function for displaying content in an IFRAME. This function is especially useful for displaying interactive webpages in CMSimple.
How to wrap... wrap-iframe-function-readme.html