Key caps (now it seems it is called the Character Palette) was in os9 then I'm sure it showed its face in osx. Keycaps was a picture of the keyboard- when you pressed the alt key or option key the keyboard charecters changed so if you wanted to type a ligature or ® or even´®´´¥¨^ø....etc it would show you where they were on the keyboard and what fuction key to press.
I went to help and it said ....; but I cant seem to find Character Palette!!!!
To use the Character Palette:
Open the application you want to type in, and place the insertion point where you want the special character or symbol to appear.
Choose Edit > Special Characters to open the Character Palette, or click the Input menu icon in the menu bar and choose Show Character Palette.
Choose the type of characters you want to see from the View pop-up menu at the top of the Character Palette window.
If you don't see the View pop-up menu, click the button in the upper-right corner of the Character Palette to show the top portion of the window. Click this button again to hide the top portion of the window.
Click an item in the list on the left to see the characters that are available in each category.
Double-click the character or symbol in the right column that you want to insert into your document.
You can also select the character and click Insert. To see more options for each character, such as the variations in glyphs for some characters, click the Character Info triangle and then the Font Variation triangle at the bottom of the Character Palette window."
I cant see how to do it ...."choose Show Character Palette" well it aint there!!! It must be me ; but .......aargh!!!!!