Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. OTcl usually refers to an object oriented extension of Tcl created by David Wetherall at MIT. It is used in network simulator (NS-2) and usually run under Unix environment. This was later extended into XOTcl. OTcl may also refer to the unrelated IXI Object Tcl extension by Dean Sheenan. These object Tcl extensions predate the more popular incr Tcl. The reserved word Class is used to represent class and method of class are declared using word instproc. The variable self is pointer to the class it is used in and is equivalent to variable this of C++/Java.

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