Apple Macintosh PowerBook 1400 - Manual (Page 73)

Finding out which programs are open
If you have several programs and windows open, you can find out which
program is active and which other programs are open by pulling down the
Application menu.
Switching programs
You can switch to another open program or desk accessory by choosing its
name from the Application menu.
If a program’s icon is dimmed in the menu, that means its windows are
hidden. Choosing the program from the Application menu displays its
windows.
You can also switch to another program by clicking in a window that belongs
to an open program, or by double-clicking a program icon (or the icon of a
document that was created with the program).
Hiding and showing windows on the desktop
You can hide all windows except those of the active program by choosing
Hide Others from the Application menu.
The other programs remain open even though their windows are hidden.
When you switch to another program, its windows become visible again.
If you want to see all the open windows, choose Show All from the
Application menu.
73 Installing and Using Application Programs