Hope this helps w/the Eudora problem:
Window Context Menu
If you right-click the tab or border of a single tool window, or on
any tab or the border of a tabbed window, Eudora displays a context
menu containing window-management commands.
The commands on the context menu are described below.
Note that if you right-click in the interior of some tool windows,
and sometimes on an item in the window itself, these
window-management commands appear at the bottom of the context menu
(right-click) specific to that tool window.
This submenu is always available on the window context menu. It lets
you change the location of the tabs in a tabbed window, and lets you
show and hide the tab in a single-tabbed window.
By default, Eudora places window tabs at the bottom of a tabbed
window. Choose Top, Bottom, Left, or Right from this submenu to move
the tabs to the top of the tabbed window, the bottom, or the left or
right side. Eudora places a bullet (radio button) next to the current
tab location selection.
Changing tab locations can sometimes increase the visible space
within a tabbed window. For example, a short-and-wide tabbed window
(one docked horizontally) might show more content if you move the
tabs to the right side.
Show Single Tab is available in a single-tabbed window, and lets you
show or hide the tab. A checkmark next to the command indicates that
the tab is shown (the default). This command is not available in a
tabbed window containing two or more tabs; you cannot hide the tabs
in such a window.
This command controls the ability to dock of floating and docked
windows. It is available only when the Float In Main Window command
is turned off (unchecked). It is not available for normal windows
(that is, when Float In Main Window is turned on).
A checkmark next to the command indicates that it is on.
When this command is on for a docked or floating window, the window
can be docked to any edge of the main Eudora window.
When Allow Docking is turned off for a docked window, the window is
converted to a floating window and cannot be redocked. When the
command is turned off for a floating window, the window cannot be docked.
Even with Allow Docking on, you can hold down the Ctrl key while
dragging a docked or floating window to suspend its ability to dock
until you release the key.
This command is always available on the context menu.
Choose Hide to hide (close) the tool window or tabbed window. Hide
performs the same function as the Close command (Ctrl+F4) on the
standard MS Windows window context menu (right-click).
Note, however, that when you hide or close a tool window, its
content, state, and position are all preserved. And when you hide or
close a tabbed window, the content, state, and position of all member
windows are preserved. Thus, if you hide and redisplay a floating
tabbed window, the window floats in its same position.
If you attempt to hide or close a tool window that contains unsaved
changes, or a tabbed window in which the active window contains
unsaved changes, Eudora asks you if you want to save your changes.
To redisplay a tool window after you've hidden it, select it from the
Tools menu. To redisplay a tabbed window after you've hidden it,
select one of its member windows from the Tools menu. The tabbed
window redisplays with the selected window active. You can use
keyboard shortcuts to redisplay hidden tool or tabbed windows where
Float In Main Window
This command is always available on the context menu (right-click).
Turning this command on (indicated by a checkmark next to the
command) converts a docked or floating window to a normal window.
Turning this command off converts a normal window to a docked or
Note that the availability of the Allow Docking command depends on
the state of this command. When Float In Main Window is turned on
(checked), Allow Docking is unavailable (the window is normal). When
Float In Main Window is turned off, Allow Docking is available.