You cannot skip parameters passed into EXE. The best you can do is to use placeholders for empty parameters that your EXE understands. See How to pass parameters to VFP EXE FAQ #17861 for more info.

>I am using shell object to run an application (which accepts 3 parameters).my code is

>lc_runcmd	= "vipeasyclaim.exe " + lc_runtype + " " + lc_key + " " + lc_woption
>lo_Shell = createobject("wscript.shell")
>if type("lo_Shell") = "O"
>        * ---Object was created - Run the command---
>        QQwState    = 4 &&7                 && Run the Dos Command in a Minimised Window
>        QQwait      = 0            		    && 0 = NoWait, 1 = Wait
>	
>        lo_Shell.Run(lc_runCmd,QQwState,QQwait)
>        wait clear
> else
>        * Problem creating the object
>        =messagebox("ERROR: Could not create an object to run the executable ")
>ENDIF

>
>its works fine.sometimes one of these parameters can be empty.in this example say lckey is empty and when i run above code its taking only 1st parameters ignoring 2nd(which is empty) and 3rd param which has value.
>