Edit control modifies the current line of text

[Davider]

Thanks again 
 The following code is short and effective, but I don't know why 

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#sub SetCurLine2
function h str's

int cursorPos = SendMessage(h EM_CHARFROMPOS 0 -1)

int cpos = cursorPos&0xFFFF

int line = cursorPos>>16

int lineStart = SendMessage(h EM_LINEINDEX line 0)
SendMessage(h EM_SETSEL lineStart cpos)

_s.getsel
_s+ s
SendMessageW h EM_REPLACESEL 1 @_s

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I can't understand the following code. Where can I find this explanation?

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cursorPos&0xFFFF
cursorPos>>16