Can you show a command line that behaves as if the value R or F are accepted? Maybe something like this entered in a command prompt: P:\SAS PD\LEGS\G3\LEGS Release.exe <R The redirect can be used to send a parameter to standard input depending on the program. If that works then you could create a SAS call that creates the appropriate call but that depends on Where is the R or F that you want set or stored? SAS cannot pass something it has not processed?   Which environment are you running SAS in? EG has a Prompt to submit such stuff, SAS Display manager can use the WINDOW data step functionality or the macro facility %WINDOW to request user input. ... View more