MDIMode and InitialMDIMode are no longer boolean, they are enumerated values.

These two properties still equal 0 when in SDI mode and -1 when in MDI mode, but they now equal -2 when set to Split Window mode. Any code which checks for MDIMode <> 0 or code like: IF MDIMode THEN … will need to be modified if the program should not run in Split Window mode.