Adjusting the Maximum Number of SAP GUI Sessions per User
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Версия на русском: Количество сессий на одного пользователя
If, for some reason, you need to change the number of sessions allowed per user in order to get rid of messages like this one:
You need to modify the parameter rdisp/max_alt_modes using transaction RZ11. By default, this parameter is set to 6.
A small thing, but a nice one.