If-Then Structure

Hello,
i'm quiet new to NSIS,
but something I don't understand is how can I make an If-Then thing?
Like this:

If (Var1 And Var2) = 0 Then
 MsgBox "Program is not running!"
Else
 If (Var1 And Var2) <> 0 Then
  MsgBox "Program is running! Quit it."
 End If
End If 

Thank you,
but can I check two variable at once?
Like in Delphi (Var1 AND Var2)

Use multiple StrCmp commands.