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Next item in the same group. Wraps around to beginning of group when
the end of the group is reached.

=item EDI_NEXTTABITEM

Next item with style WS_TABSTOP. Wraps around to beginning of dialog
item list when end is reached.

=item EDI_PREVGROUPITEM

Previous item in the same group. Wraps around to end of group when the
start of the group is reached. For information on the WS_GROUP style,
see Window Styles.

=item EDI_PREVTABITEM

Previous item with style WS_TABSTOP. Wraps around to end of dialog
item list when beginning is reached.

=back

=item DesktopWindow()

gets the actual window handle of the PM desktop; most APIs accept the
pseudo-handle C<HWND_DESKTOP> instead.  Keep in mind that the WPS
desktop (one with WindowText() being C<"Desktop">) is a different beast?!

=item TopLevel($hwnd)

gets the toplevel window of $hwnd.

=item ResetWinError()

Resets $^E.  One may need to call it before the C<Win*>-class APIs which may
return 0 during normal operation.  In such a case one should check both
for return value being zero and $^E being non-zero.  The following APIs
do ResetWinError() themselves, thus do not need an explicit one:

  WindowPtr
  WindowULong
  WindowUShort
  WindowTextLength
  ActiveWindow
  PostMsg

This function is normally not needed.  Not exported by default.

=back

=head2 Control of the PM data

=over

=item ActiveDesktopPathname()

gets the path of the directory which corresponds to Desktop.

=item ClipbrdText()

gets the content of the clipboard.  An optional argument is the format
of the data in the clipboard (defaults to C<CF_TEXT>).

Note that the usual convention is to have clipboard data with
C<"\r\n"> as line separators.

=item ClipbrdText_set($txt)

sets the text content of the clipboard.  Unless the optional argument
is TRUE, will convert newlines to C<"\r\n">.  Another optional
argument is the format of the data in the clipboard (defaults to
C<CF_TEXT>).

=item 	InvalidateRect

=item	CreateFrameControl

=item	ClipbrdFmtInfo

=item	ClipbrdOwner

=item	ClipbrdViewer

=item	ClipbrdData

=item	OpenClipbrd

=item	CloseClipbrd

=item	ClipbrdData_set

=item	ClipbrdOwner_set

=item	ClipbrdViewer_set

=item	EnumClipbrdFmts

=item	EmptyClipbrd

=item	AddAtom

=item	FindAtom

=item	DeleteAtom

=item	AtomUsage

=item	AtomName

=item	AtomLength

=item	SystemAtomTable

=item	CreateAtomTable

=item	DestroyAtomTable

Low-level methods to access clipboard and the atom table(s).

=back

=head1 OS2::localMorphPM class

This class morphs the process to PM for the duration of the given scope.

  {
    my $h = OS2::localMorphPM->new(0);
    # Do something
  }

The argument has the same meaning as one to OS2::MorphPM().  Calls can
nest with internal ones being NOPs.

=head1 TODO

Add tests for:

	SwitchToProgram
	ClassName
	out_codepage
	out_codepage_set
	in_codepage
	in_codepage_set
	cursor
	cursor_set
	screen
	screen_set
	process_codepages
	QueryWindow
	EnumDlgItem
        WindowPtr
        WindowULong
        WindowUShort
        SetWindowBits
        SetWindowPtr
        SetWindowULong
        SetWindowUShort
	my_type
	file_type
	scrsize
	scrsize_set

Document and test: Query/SetWindowULong/Short/Ptr, SetWindowBits.
InvalidateRect, CreateFrameControl, ClipbrdFmtInfo ClipbrdOwner
ClipbrdViewer ClipbrdData OpenClipbrd CloseClipbrd ClipbrdData_set
ClipbrdOwner_set ClipbrdViewer_set EnumClipbrdFmts EmptyClipbrd
AddAtom FindAtom DeleteAtom AtomUsage AtomName AtomLength
SystemAtomTable CreateAtomTable DestroyAtomTable

Implement SOMETHINGFROMMR.


  >But I wish to change the default button if the user enters some
  >text into an entryfield.  I can detect the entry ok, but can't
  >seem to get the button to change to default.
  >
  >No matter what message I send it, it's being ignored.