Apple PowerBook (3400 series) - Manual (Page 80)

Working with several programs at a time
You can open as many application programs and desk accessories as your
computer’s memory allows.
All open programs are listed in the Application menu at the right end of the
menu bar. The name of the active program (the one you’re using right now)
has a checkmark next to it, and its icon appears in the menu bar.
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 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).
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The Finder icon
A checkmark
indicates the
active program.
Commands to hide or
display open windows
Open programs