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PINKY REGHUPINKY REGHU 

How many users can login to salesforce using the same username at same time?

VinayVinay (Salesforce Developers) 
Hi Pinky,

Yes, multiple users can log in without any issues, but its a threat for data integrity, security, and auditing also it's a violation of (http://www.salesforce.com/assets/pdf/misc/salesforce_MSA.pdf) and limits depend upon your licenses.

Hope this helps...

Thanks,
Suraj Tripathi 47Suraj Tripathi 47
Hi Pinky,

You can have multiple users log in under the same user account at the same time. I've logged into Salesforce on 2 pcs at once with no problems.
 
The only problem that you'll encounter is that you will not be able to differentiate between records created or modified by one of these individual users or another - they will all be labelled with the same username.

If you find your answer mark as best answer
Thanks and regards,
Suraj Tripathi.
Julian LeahJulian Leah

I had no idea multiple users can log in. Multiple users can't even login at https://technicalustad.com/problems-do-first-year-students-have-in-college/ (http://I had no idea multiple users can log in. Multiple users can't even login at https://technicalustad.com/problems-do-first-year-students-have-in-college/. So all in all, I'm rather surprised it's the case here.). So all in all, I'm rather surprised it's the case here.