devenv /debugexe "%IQDIR16%\bin32\iqsrv16.exe" [commandline options for your server]
                    Each platform will have a debugger and each will have their
                        own command line syntax. SAP Sybase IQ source code is
                        not required. The msvs debugger will recognize when the user-defined
                        functions source is executed and break at the set breakpoints. When control
                        returns from the user-defined functions to the server, you will only see
                        machine code.