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You enter calculations on the Calculator by typing them in. You do not choose commands or numbers by highlighting parts of the screen, as you might in other SCO Shell applications.
The keys that you see on the screen are reminders or prompts for the Calculator commands. The actual commands are the first letters of the function key names. For example, to press the Off key, you type o; to press the Sto (store) key, you type s; and so on. The following section details the Calculator's features, including the use of the scrolling tape, the memories, and the percentage key.