>my employees have to make programs for which i need them to use some classes which i have created. is it possible for them not to be able to see the source and still use them.
Yes it's possible.
- Make the copies of you class libraries
- Open each of them as table and blank out Method memo field

USE myclasslib1.vcx
REPLACE ALL Meyhod WIT SPACE(0)
USE

- Tell your employees to use those modified class
- Advise them that they cannot use Recompile All Files option in a project build because it'll wipe out object code in above class libraries.

You'll have to repeat this process every time you make changes to your class libraries but you can write program that will handle that for you.