1 - How to use the DLL shell32.dll to open and close one or more internet connections?

2 - Which are the parameters of the ShellExecute function of shell32.dll?

3 - When CTRL+ALT+SUPPR is made, in the window 'Close the programme' which is displayed, there is the list of all the programs in the course of execution. Which DLL makes it possible to have this list and how to close a precise program?