As long as you keep your password secure, you can use the same password for networking, Windows, VMS, etc. Someone could easily guess your password if you choose the names of children, grandchildren, spouses, and pets. Do not use common words or phrases. Do not share your passwords with anyone. Use at least one number in your password.
Hackers often use on-line dictionaries.
If you feel that one of your passwords is no longer secure, refer to the instructions in General Password Help to change the specified password. This is generally not a good practice. I gave one of my passwords to someone for temporary use, and I think that person is still using it. Change the password as quickly as possible. Refer to the instructions in General Password Information.