29  * A "word" is a function with a name. Words can be either native or
39 abstract class Word {  class
42 	 * The compiler context for this word.
50 	 * source code, even while compiling another word.
57 	 * Each word has a unique name. Names are case-sensitive.
71 	 * Each word may have a known stack effect.
77 	internal Word(T0Comp owner, string name)  in Word()  method in Word
85 	 * Resolving a word means looking up all references to external
93 	 * Execute this word. If the word is native, then its code is
94 	 * run right away; if the word is interpreted, then the entry
105 	 * of the generated C code, a word must either be interpreted,
114 	 * resolving the word.
116 	internal virtual List<Word> GetReferences()  in GetReferences()
118 		return new List<Word>();  in GetReferences()
123 	 * implies resolving the word.
131 	 * Produce the code elements for this word.
135 		throw new Exception("Word does not yield code elements");  in GenerateCodeElements()
139 	 * Compute/verify stack effect for this word.
146 	 * Get maximum data stack usage for this word. This is the number
147 	 * of extra slots that this word may need on the data stack. If
165 	 * Get maximum return stack usage for this word.