This function sets the provided Tcl object as
associated information to the specified Collection object. This
"associated information" (Tcl object) can contain anything that the
user wants to store ("associate") with this Collection.
Return Value:
The return value from this function will be a standart Tcl completion
code (of type int) with one of the values TCL_OK and TCL_ERROR. If the
requested Collection exists and the information Tcl object is
successfully associated with the Collection, then TCL_OK will
be returned. In case of an error, the return value will be TCL_ERROR and
an error message describing the error will be left at the current Tcl
interpreter (CDM_Interp).