Passing command-line parameters from Windows to VFP created EXE is different from passing parameters to VFP programs or functions in VFP application:

• All parameters are passed to EXE as strings
• Parameters should not be enclosed in single quotes because quotes will be treated as part of parameter
• Parameters with spaces can be enclosed in double quotes
• Parameters are separated by spaces not commas

Syntactically there is no difference between FUNCTION and PROCEDURE statements in VFP. In other languages, that have both statements, a function can return a value and a procedure cannot. In VFP the difference comes in the way a procedure/function is called. By default VFP passes parameters by value in call to the functions, by reference to the procedures ( DO ...) and only former allows for a return value.