If you are using a Windows Computer and Internet Explorer, you can setup NetDocuments to automatically login you into the website, ndoffice, ems profiler, ems folders, ndsync, and the folder import tool. If your office has a server with active directory, you simply need to check a box. If it does not, you need to install a certificate.
In NetDocuments go to Setup –> Login Information
Step 1: Make sure Internet Explorer is your default browser.
Step 2: Go to Comodo https://www.comodo.com/home/email-security/free-email-certificate.php
Step 3: Fill out this information
If you get a new computer within a year, you will need to revoke this certificate so you can reinstall it. Make a note of this password and if that happens, go to https://secure.comodo.com/products/!SecureEmailCertificate_Revoke
Step 4: Open your email and wait for about 5 minutes. Click on the big red button in the email
Step 5: Click Ok
Step 6: Log into NetDocuments and go to Setup –> Login Information. Check Allow certificate based login
Step 7: Make sure the Comodo Certificate is selected and click OK
Step 8: Log out of NetDocuments and go back to the login screen. Click on Need Login Assistance
Step 9: Click I want to login using a personal digital certificate
Step 10: Choose the Comodo Certificate again and click OK
One thing to note. If you have 2 computers you can export your certificate out of the first one, import it into the second one, and have NetDocuments auto login.
How to import and export your certificate: https://www.sslsupportdesk.com/how-to-export-a-certificate-from-internet-explorer/