用几种方式实现窗体和控件透明

delphi源码，用几种方式实现窗体和控件透明化和半透明化，通过处理窗体方式实现透明，直接使Panel控件透明半透明化。每种方式提供详细注释说明。

1804控件透明
Back.bmp
Project2.cfg
Project2.dof
Project2.dpr
Project2.exe
Project2.res
Project2.stat
Project2.~dpr
test.bmp
uMaskFrm.dcu
uMaskFrm.ddp
uMaskFrm.dfm
uMaskFrm.pas
uMaskFrm.~ddp
uMaskFrm.~dfm
uMaskFrm.~pas
uMaskShowFrm.dcu
uMaskShowFrm.dfm
uMaskShowFrm.pas
uMaskShowFrm.~dfm
uMaskShowFrm.~pas
Unit1.dcu
Unit1.ddp
Unit1.dfm
Unit1.pas
Unit1.~ddp
Unit1.~dfm
Unit1.~pas
Unit2.dcu
Unit2.ddp
Unit2.dfm
Unit2.pas
Unit2.~ddp
Unit2.~dfm
Unit2.~pas
Unit3.dcu
Unit3.ddp
Unit3.dfm
Unit3.pas
Unit3.~ddp
Unit3.~dfm
Unit3.~pas
Unit4.dcu
Unit4.ddp
Unit4.dfm
Unit4.~dfm
Unit4.~pas