Development, round II

Thanks everyone for their help. I shall sometime consider PC-DOS with REXX as an environment for my AT or possibly one of my Compaqs... Am I right in thinking that OS/2 _won't_ run on an AT? ORIGINS OF REXX I met REXX in what I believe to be its native habitat - as the macro language for VM/CMS running on an IBM 370 descendant mainframe. It replaced a language called EXEC2, whose main distinguishing feature was % signs everywhere (although I can't remember what they meant). This in turn replaced a language called (you guessed it) EXEC. REXX is/was quite a nice language to use, but some features rendered it unsuitable for serious programming - numbers, for example, are stored as strings of digits in the character code of the machine you are using... Philip.