1) Boy scout tie 2) DC Comics supervillain 3) Discontinued web browser 4) Half-hitch kin 5) It creates an adjustable loop 6) Knot 7) Masked musician 8) Noose 9) Sheepshank alternative 1) Noose 
[web browser] SlipKnot was one of the earliest World Wide Web browsers, available to Microsoft Windows users between November 1994 and January 1998. It was created by Peter Brooks of MicroMind, Inc. to provide a fully graphical view of the web for users without a SLIP or other TCP/IP connection to the net, hence the name - SLIP...not. SlipK...
• (n.) knot which slips along the rope or line around which it is made.
(from the article `knot`) ...surgeon`s knot and the square knot. An overhand knot is made by crossing the rope end around the standing part to form a loop, bringing the rope`s ...
Slip'knot` noun knot which slips along the rope or line around which it is made. 
[n] - a knot at the end of a cord or rope that can slip along the cord or rope around which it is made
noun a knot at the end of a cord or rope that can slip along the cord or rope around which it is made