effect of tag number

[melis]

Dear Vesna;

i have some questions about tag number. in my model, i choose arbitrary tag number for example; "ConfinedConcrete01 1 ..." or "steel01 5..." but when i search some document i found this link "http://osfeo.googlecode.com/svn-history ... lassTags.h". in this web site include source code about material.cpp or another useful code.
$Source: /usr/local/cvs/OpenSees/SRC/classTags.h,v $ but this one really confuse me because of "#define DEG_TAG_UNLOAD_Takeda 2(tag)" or "#define BACKBONE_TAG_Multilinear 6(tag)" this type of code. what is the meaning of this number (like 2 and 6)?
if it is useful i really want to learn how i use this new material properties. for example; if i want to use "DEG_TAG_UNLOAD_Takeda" model how can i apply to in my uniaxialMaterial?

thank you so much..