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===Structure of the compiler===
The compiler itself is not a monolithic program. It consists of Forth words visible to the system, and usable by a programmer. This allows a programmer to change the compiler's words for special purposes. Compilation in traditional Forth systems is straightforward and does not involve building and optimizing an abstract representation of the code. (Some newer Forth compilers use more elaborate compilation methods, as common in other languages.)
The "compile time" flag in the name field is set for words with "compile time" behavior. Most simple words execute the same code whether they are typed on a command line, or embedded in code. When compiling these, the compiler simply places code or a threaded pointer to the word.<ref name="compiler" />
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