Yes. The 4th parameter for SDKInstanceManager.OpenDatabase is a boolean 'openMultiUserMode'

There is a good sample file 'sdkexample.cs' in the c# folder.

Somewhere around line 1500 is:
if (SDKInstanceManager.Instance.OpenDatabase(saiFile, username, password, false,

I hope that helps, please post back!
Randy

Thank you,
So we need to have the multiUserMode module. If the client don`t have that module, he can`t be connected in the interface in same time the SDK push some information?

Sorry, I did not read the question carefully. Multi User Mode vs. Single User Mode is a license or setup issue. There is no multi user software module that has to be installed.

The number of users allowed shows in Help | About... when you click on the 'Support Info' button.

If the number of users allowed is more than 1, additional users can be created under Setup, after adding a password to the 'sysadmin' account. The maximum number of password characters is 7