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Usernames are associated with user IDs (UIDs). UIDs are numbers from zero to 65534. Check out the /etc/passwd file. Every username is assigned a number. i.e
root UID 0 and nobody is 65534. AFAIK it depends on the distribution but normal users typically start at 500.
If your asking about how many concurent connections on a server then that would be determined by the application and server hardware.
for clarification, it's not so much concurrent connections. We are currently have a server that receives data from our clients for a data warehouse. Unfortunately our current setup requires us to have each client exist as a user on the server and we were just wondering if/when we would run into a wall with that.
Version 2.6 - current (December 17, 2003 to the present)
.....
# Increased the maximum number of users and groups each from 65,536 to over 4 billion.
# Increased the maximum number of process ids from 32,768 to over 1 billion.
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