I'm struck by the number of people who have a tablet but don't use it as a tablet. So this is a back to basics post - you've got a tablet, here's how to enter text with a pen.
Anywhere you can type you can enter text on a tablet using the stylus. This is an important point because the upshot is that pretty much any application will run on a tablet. when you tap the stylus in a text entry field you will see this little guy pop up.
This is the TIP icon, and clicking it launches the Tablet Input Panel or TIP.
The TIP offers three basic text entry options. With a couple of exceptions the TIP will open in the last mode you used, but you can switch with these three buttons up in the top left corner of the TIP.
The left most button enables the writing pad...
It's pretty simple - you write and the recognised text is displayed below.
If a word is wrong you can tap the recognised word to correct it.
The corrections interface actually uses the second TIP mode, the character pad. you can switch to character pad by clicking the middle button in the top left corner of the TIP.
Character pad is test entry that uses handwriting...
The last mode of text entry is the on screen keyboard.
Access this by tapping the right button in the top left of the TIP.
These three methods are the key ways to enter text on a tablet. Try then all, learn their strengths and weaknesses. You will find they all have a place.