Thx a lot for your long explanation of Strings. Here is another one that has me baffled. My code in a procedure: procedure doHeader (pageNum, numPages : Integer); var pageNumStr, numPagesStr : Str255; the call: NumToString(pageNum,pageNumStr); I get compile error: error: type mismatch in argument 2 of `NumToString' In NumberFormatting.p procedure NumToString(theNum: SInt32; var theString: Str255); external name '_NumToString'; What do I need to do in this case? Thx Ken