Updated BefunGen to >> BefunUtils

www/data/programs/desc/BefunUtils/02_TextFunge/03_Limitations.markdown

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+There are a few things you should consider when creating programs with Befunge:
+
+###Number ranges
+
+The size of the internal numbers is dependent on the interpreter, while you can safely assume that the number is at least 16bit, everything higher is not sure.
+So for bigger programs you have to either work with smaller numbers or use interpreters which use bigger sizes.
+
+> **Tip:**  
+> [BefunExec](/programs/view/BefunGen) uses 64bit integer (= long values).
+
+###Negative numbers
+
+A real problem are negative numbers. In created programs variables are saved in the grid.
+If the interpreter does not support negative grid values you will not be able to use negative numbers.
+
+But don't worry too much - most interpreters I know support negative numbers in the grid.
+
+###Performance
+
+BefunGen is definitely not a tool to create fast Befunge programs, it's a tool to create big ones.  
+And while it optimize your program quite a bit, a manual written program will always be faster and smaller.
+
+So for bigger programs you will also need an fast interpreter - otherwise the execution could take a long time
+
+> **Tip:**  
+> [BefunExec](/programs/view/BefunGen) is a pretty fast multi-threaded interpreter.
+
+
+###Program size
+
+While the generated programs are strictly bound to the Befunge-93, they can become pretty big (bigger than 80x25).
+
+So you have to either use a Befunge-93 interpreter which ignores the size limit (many interpreters do that)
+or use a Befunge-98 interpreter.
+
+> **Tip:**  
+> [BefunExec](/programs/view/BefunGen), as you probably can assume, has no "real" size limit to it.