紧急求助WINDOWSAPI函数的用法？？？？(100分)

哪位大侠来解释一下下面代码的用途<br>var<br>&nbsp; Li_HWND:Thandle;<br>Li_HWND:=FindWindow('TfrmmainManager',nil);<br>&nbsp; &nbsp; if Li_HWND&lt;&gt;0 then<br>&nbsp; &nbsp; &nbsp; Begin<br>&nbsp; &nbsp; &nbsp; &nbsp; if (not IsWindowVisible(Li_Hwnd)) then<br>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; PostMessage(Li_HWND,wm_User,0,0);<br>&nbsp; &nbsp; &nbsp; &nbsp; SetForeGroundWindow(Li_HWND);<br>&nbsp; &nbsp; &nbsp; end

查找窗口类名为 TfrmmainManager<br>如果找到即得到窗口句柄<br>判断该窗口是否可见，如果不可见邮寄一条WM_USER消息<br>然后将该窗口提到前台<br><br>完了

谢谢