event handling in delphi - delphi

Question

I got a sample of code im trying to understand in delphi,can anyone explain this means below,i know it creates and sets events but im trying to understand why the (nil,true,false,'pishu') i want to know the significance of the nil,true,false and the word in inverted comma's it seems i can write any word in there.
var
Form1: TForm1;
h:thandle;
st:string;
fopen:textfile;
countstr:integer;
implementation
{$R *.dfm}
procedure TForm1.Button2Click(Sender: TObject);
begin
setEvent(h);
CloseHandle(h);
end;
procedure TForm1.Button3Click(Sender: TObject);
begin
h:=createevent(nil,true,false,'pishu');
resetevent(h);
end;
end.
procedure TForm1.Button1Click(Sender: TObject);
begin
h:=createevent(nil,true,true,'pishu');
waitforsingleobject(h,infinite);
image1.Canvas.Brush.Color:=clblack;
image1.Canvas.Ellipse(random(image1.Width-100),random(image1.Width),random(image1.Width),random(image1.Width));
image1.Canvas.Brush.Color:=clyellow;
image1.Canvas.Ellipse(random(image1.Width-100),random(image1.Width),random(image1.Width),random(image1.Width));
image1.Canvas.Brush.Color:=clblue;
image1.Canvas.Ellipse(random(image1.Width-100),random(image1.Width),random(image1.Width),random(image1.Width));
image1.Canvas.Brush.Color:=clred;
image1.Canvas.Ellipse(random(image1.Width-100),random(image1.Width),random(image1.Width),random(image1.Width));
image1.Canvas.Brush.Color:=clgreen;
image1.Canvas.Ellipse(random(image1.Width-100),random(image1.Width),random(image1.Width),random(image1.Width));
//рисуем квадраты
image1.Canvas.Brush.Color:=clblack;
image1.Canvas.Rectangle(random(image1.Width-100),random(image1.Width),random(image1.Width),random(image1.Width));
image1.Canvas.Brush.Color:=clyellow;
image1.Canvas.Rectangle(random(image1.Width-100),random(image1.Width),random(image1.Width),random(image1.Width));
image1.Canvas.Brush.Color:=clblue;
image1.Canvas.Rectangle(random(image1.Width-100),random(image1.Width),random(image1.Width),random(image1.Width));
image1.Canvas.Brush.Color:=clred;
image1.Canvas.Rectangle(random(image1.Width-100),random(image1.Width),random(image1.Width),random(image1.Width));
image1.Canvas.Brush.Color:=clgreen;
image1.Canvas.Rectangle(random(image1.Width-100),random(image1.Width),random(image1.Width),random(image1.Width));
CloseHandle(h);
end;
end.

Answer 1

CreateEvent takes several parameters. It's defined on MSDN as HANDLE CreateEvent(
LPSECURITY_ATTRIBUTES lpEventAttributes, BOOL bManualReset, BOOL bInitialState, LPTSTR lpName). The parameters are:
lpEventAttributes
==================
Ignored. Must be NULL.
bManualReset
============
Boolean that specifies whether a manual-reset or auto-reset
event object is created. If TRUE, then you must use the
ResetEvent function to manually reset the state to nonsignaled.
If FALSE, the system automatically resets the state to nonsignaled
after a single waiting thread has been released.
bInitialState
=============
Boolean that specifies the initial state of the event object.
If TRUE, the initial state is signaled; otherwise, it is nonsignaled.
lpName
======
Pointer to a null-terminated string that specifies the name of the
event object. The name is limited to MAX_PATH characters and can contain
any character except the backslash path-separator character (\). Name
comparison is case sensitive.
If lpName matches the name of an existing named event object, the bManualReset
and bInitialState parameters are ignored because they have already been set by
the creating process.
If lpName is NULL, the event object is created without a name.
If lpName matches the name of an existing semaphore, mutex, waitable timer,
job, or file-mapping object, the function fails and the GetLastError function
returns ERROR_INVALID_HANDLE. This occurs because these objects share the same
name space.
This explains why you can type almost anything as the "word with inverted commas" (the lpName).
For more information, you can see the MSDN web site's documentation on CreateEvent
here.

Answer 2

MSDN is your friend when it comes to API documentation questions .See this for answers to your question about CreateEvent.