Programs can only be used by users on the local PC that the program was installed on. Other PCs on the Homegroup would need to have the programs installed on it as well.
In that case, you or they should be able to create shortcuts to the .exe files of these programs in their accounts for them to use to open the program.
The tutorial below can help show you how to create a shortcut, but the .exe files will be at wherever the program was installed to. Programs are usually installed in a folder (name after program) in the "C:\Program Files" folder.