"So if you had a large form that done complex stuff it wasn't unusual to have a multi thousand line long form file." Just a small quibble - you would typically

"So if you had a large form that done complex stuff it wasn't unusual to have a multi thousand line long form file." Just a small quibble - you would typically move shared-code into seperate module files. The other biggest challenge we had was when trying to build a larger solution that worked with COM dependencies amongst multiple projects, you would occasionally have to do a clean-build which break binary compatibility (don't forget to do a registry cleanup!), and that mean "compiling" your tree manually, from the base level components upwards. That got much easier if you could get your hands on a Microsoft MCS tool called, VBBuilder. (I can't remember if it ever was available for open/free download)