Canon NP6551 Operator's Manual page 32

Transparency Interleaving key
Press to select or cancel the Transparency Interleaving
mode. This mode enables you to insert a copy sheet
between transparencies. You can copy onto interleaf
sheets or leave them blank. (See p. 3-30.)
Overlay key
Press to select or cancel the Sheet Overlay or Book
Overlay functions. This mode enables you to superimpose
two original images onto a single copy sheet. (See p. 3-35.)
Cover/Sheet Insertion key
Press to select or cancel the Cover/Sheet Insertion mode.
This mode enables you to add a front and back cover of
different paper stock (for example colored paper). You can
also insert up to 20 copy sheets at a specified page
number. (See p. 3-14.)
Two-Page Separation key
Press to select or cancel the Two-page Separation mode.
This mode enables you to copy bound originals such as
books, in one step. If necessary, you can have copies
output face down. (See p. 3-33.)
Different Size Original key
Press to select or cancel the Different Size Original mode.
This mode enables you to feed different-size originals
together in one group in the RDF providing that the leading
edge of each page is the same length. (See p. 3-39.)
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