Autodesk AUTOCAD 2006, Command Reference Manual, Page: 702 / 1490

MC
Creates a merged-cross intersection between two multilines. The order in
which you select the multilines is not important.
CT
Creates a closed-tee intersection between two multilines. The first multiline
is trimmed or extended to its intersection with the second multiline.
OT
Creates an open-tee intersection between two multilines. The first multiline
is trimmed or extended to its intersection with the second multiline.
MT
Creates a merged-tee intersection between two multilines.The multiline is
trimmed or extended to its intersection with the other multiline.
CJ
Creates a corner joint between multilines. The multilines are trimmed or
extended to their intersection.
AV
Adds a vertex to a multiline.
DV
Deletes a vertex from a multiline.
CS
Creates a visual break in a selected element of a multiline.
CA
Creates a visual break through the entire multiline.
WA
Rejoins multiline segments that have been cut.
MLINE
Creates multiple parallel lines
678 | Chapter 14