HP L5 manual Operation Description

Operation	Description
0	Sets the current Font ID to the given String ID. This operation allows
	the user to set the current PCL Font ID to a string name, which gives the
	user the ability to download fonts to a string name. If the current Font ID
	has been set with both the Alphanumeric ID command and the Font ID
	command (?*c#D), the ID last sent takes precedence. For example, if the
	current font ID was set to 10 and then to “Font1”, the current font ID would
	be “Font1”.
1	Associates the current Font ID to the font with the String ID
	supplied. This operation finds the font with the supplied String ID and
	assigns the current Font ID to that font so that the font now has two names.
	The original font name is used to perform font management commands on
	the font, and the new associated name is used when selecting the font for
	usage. Note that since fonts with string names can be associated to numeric
	Font IDs, these fonts are selectable in HP-GL/2 using the numeric Font ID.
2	Selects the font referred to by the String ID as primary. This operation
	finds the associated font using the supplied String ID and specifies that font
	as the current primary font. The command is ignored if there is no font with
	that String ID.
3	Selects the font referred to by the String ID as secondary. This
	operation functions the same as the primary font specification (operation
	number 2), however this command specifies the font as secondary.
4	Sets the current Macro ID to the String ID. This operation allows the
	user to set the current PCL Macro ID to a String ID name. If the current
	Macro ID has been set with both the Alphanumeric ID command and the
	Macro ID command (?&f#Y), the ID last sent takes precedence. For example,
	if the current Macro ID was set to 10 and then to “Macro1”, the current
	macro ID would be “Macro1”.
5	Associates the current Macro ID to the supplied String ID. This
	operation finds the macro with the supplied String ID and assigns the
	current Macro ID to that macro. This macro then has two names. The
	original Macro ID name is used to perform macro management commands on
	the macro, and the new associated name is used when executing, calling, or
	overlaying the macro.
20	Deletes the font association named by the current Font ID. The font
	must have been associated with an alphanumeric Font ID (using operation 0).
	No String ID is supplied (?&n1W20). This command removes the alphanumeric
	font name association, however the disk resource itself is not changed.

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