<<Please excuse what is probably a dump question from a "C" neophyte but, I am tring to call the FFILEINFO Intrinsic (items 4 recsize and 10 eof). I am declaring recsize as short and eof as long. The compiler telsss me that: line 61: error 1620: Argument 3 is not the correct type. line 61: error 1620: Argument 5 is not the correct type. What am I doing wrong??>> If your "C neophyteness" is based on experience in a call-by-reference language (say, FORTRAN), you might have overlooked the fact that C is a call-by-value language. If you want a called routine, which definitely includes MPE intrinsics, to change the value of a variable, you have to explicitly pass the address of that variable. Make sure you look over Table 2-1 in the intrinsics manual and understand what the parameter-type identifiers mean. When you see something like "I16" or "U32", that is a by-reference parameter, and you need to pass the address of the appropriate variable using the '&variablename' syntax. If you'd posted the problem code (hint, hint) we would know immediately if this is the problem. I assume that you're writing CM code for an MPE V/E machine? If not, you should be using item 67 with a 32-bit unsigned integer instead of item 4 with a 'short'. Steve