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a paragraph about \protect added
< [[Main Page]]
== Using variables:==
\setvariables[namespace][key=value]
\getvariable{namespace}{key}
== Defining new commands=='''Special characters in command names''' Some commands have special characters in their names, that TeX normally does not consider to be letters: <tt>@</tt>, <tt>!</tt> and <tt>?</tt>. Before and after the use or definition of such protected commands in your input files, the catcode of these characters has to be changed. This is done by <tt>\unprotect</tt> and <tt>\protect</tt>: \unprotect \def\!test{alfa} \protect The newly defined command <tt>\!test</tt> can of course only be called upon when we are in the \unprotect ed state, otherwise TEX reads the command <tt>\!</tt>, followed by the word <tt>test</tt> (and probably complains loudly about not being in math mode). These protection/unprotection commands can be nested. When the nesting becomes deeper than one level, the system reports the current protection level. It is a good habit to always start your macro files with <tt>\unprotect</tt> and end them with <tt>\protect</tt>.
[[Commands with KeyVal arguments|Commands with Key=Value arguments]].
[[Commands with optional arguments]].
