>These 2 commands are development-time commands, correct? As the PRG or VCX is built into the EXE, won't VFP find the component the code is referring to?

No, they are runtime commands as well. VFP will find PRG or VCX that code is referring to directly. The SET PROCEDURE and SET CLASSLIB are used when components they are refering to are not referenced directly but there contents is used. For example, CREATEOBJECT() specifies a class only. How would VFP know in which VCX to look for it w/o SET CLASSLIB ?