This straight from vb-world
Code:
Hiding Your Program in the Ctrl-Alt-Del list
To do this, your must register your program as a service. This is done by passing the process ID of your application to the RegisterService API.
Declarations
Copy the following code into the declarations section of a module:
Public Declare Function GetCurrentProcessId _
Lib "kernel32" () As Long
Public Declare Function GetCurrentProcess _
Lib "kernel32" () As Long
Public Declare Function RegisterServiceProcess _
Lib "kernel32" (ByVal dwProcessID As Long, _
ByVal dwType As Long) As Long
Public Const RSP_SIMPLE_SERVICE = 1
Public Const RSP_UNREGISTER_SERVICE = 0
Procedures
To remove your program from the Ctrl+Alt+Delete list, call the MakeMeService procedure:
Public Sub MakeMeService()
Dim pid As Long
Dim reserv As Long
pid = GetCurrentProcessId()
regserv = RegisterServiceProcess(pid, RSP_SIMPLE_SERVICE)
End Sub
To restore your application to the Ctrl+Alt+Delete list, call the UnMakeMeService procedure:
Public UnMakeMeService()
Dim pid As Long
Dim reserv As Long
pid = GetCurrentProcessId()
regserv = RegisterServiceProcess(pid, _
RSP_UNREGISTER_SERVICE)
'End Code
Don't forget to unregister your application as a service before it closes to free up system resources by calling UnMakeMeService.