Workgroup Passwords

Hiya guys,

trouble is that my office is in a building with 15 other offices and we share a router. Due to this I need to secure the workgroups i create. How do I go about setting up passwords? Keeping in mind that I need to create more than one workgroup coz we have teams in ur office and they shudnt be able to see each other’s work.

I am network DUMMY guys…HELP !!!!!

Thanx