The syntax is like
RUNDLL32 SHELL32.DLL,Control_RunDLL filename.CPL,@n,t
where
filename.CPL --- is the name of one of Control Panel's *.CPL files,
n --- is the zero based number of the applet within the *.CPL file, and
t --- is the number of the tab for multi paged applets
Use this syntax as command line in the SSs user menu.
I open here f.ex. the "Environment tab" of the "System applet" :
RUNDLL32 SHELL32.DLL,Control_RunDLL SYSDM.CPL,@0,2
############
A list of all CPLs can be found e.g. here:
http://www.robvanderwoude.com/rundll.html
http://www.mvps.org/vb/index2.html?tips/shellcpl.htm
http://www.jsiinc.com/subh/tip3500/rh3562.htm
Or for germans in the WinFAQ