Apple LaserWriter 12/640 PS - Manual (Page 132)

4 Click OK to close the Page Setup dialog box.
You can make the printer’s current page setup settings the default software
settings by holding down the Option key and clicking OK. (Some programs
may not support this method of setting defaults.)
Printing documents
When you are printing from a Mac OS–based computer, most application
programs display a Print dialog box, in which you specify print options such
as the number of copies you want printed, whether to print all or part of a
document, and which paper tray or cassette will be the paper source.
Some application programs also add more choices to the Print dialog box.
For information about such options, refer to the documentation that came
with the program.
1 Choose Print from the File menu.
The Print dialog box appears.
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