There are two forms of downloadable fonts:
Permanent Soft Fonts. These are copied from the computer to the printer when the printer is first turned on, and remain there until the printer is turned off. The Windows printer driver has access to permanent soft fonts for all the documents that it prints.
Temporary Soft Fonts. These are copied from the computer to the printer on an as-needed basis during the print job. They are deleted from the printer's memory at the end of a print job.
Settings in the WIN.INI file specify whether a downloadable font is permanent or temporary. Furthermore, permanent fonts typically have a corresponding batch file that copies the fonts to the printer when the system first starts.