I have been asked whether web service interactions could cause a potential conflict with other users accessing Sage CRM through the main interface.

Basically, does a web service request consume a concurrent license? The answer is no. The SOAP Web Service logon is an additional login.

See below. You can see that I have opened several connections to Sage CRM and I am looking at the screen created by looking at the information screen

http://localhost/crm/eware.dll/sysadmin

My system allows for 3 concurrent users. In the fourth tab from the left, I had tried to log in as 'Matthew Ebden' but received the classic message 'Maximum number of users already logged on. Please contact your System Administrator' but you can see that I have been subsequently able to log in using my Web Services test app.