Use the Shell statement to execute a command of the form:
Shell "rundll32.exe shell32.dll,Control_RunDLL XXX,,#"
Where XXX is the name of the applet's control string and # is the index of the applet tab you want to display. For example, this statement displays the first tab in the Accessibility Options applet:
Shell "rundll32.exe shell32.dll,Control_RunDLL access.cpl,,1"
Not all of these will work on all systems because you may not have every applet installed.
I was also unable to get the Font Folder and Printers applets to work. Let me know if you get them working.