modifications.

codepages.

Maintain a local cache of the debug registers to avoid server calls
where possible.

- created infrastructure in ntdll to support IOCTL for serial devices
- implemented IOCTLs in ntdll for serial break support
- implemented the kernel32 equivalent on top of those IOCTLs

Check for NULL pointer.

Only use the Folder class handler if we're actually executing a
folder.

return value, not of DWL_MSGRESULT.

GlobalReAlloc should return NULL if the requested size is 0, the block
is moveable and it is locked, but otherwise it should return the
original memory block.

number of pairs.

After creating the Shell View window we should call SetWindowPos to
move the window on top of other child windows in the parent window.
Also delay the showing of the window so that we can do more
initialisation after window creation without it causing visual
artifacts.