Restrict multiple user to access same task

When a task is assigned to an individual user, no other user will see it.  If it's assigned to a group and/or multiple users, then the first person to accept it will be able to see it and the others will not.

Yes , its default but what if we have to do manually

Please clarify what you mean by "manually" in this context.

Actually what if there is no default behaviour , then is there any way to do

When creating a process flow with user input tasks, you are required to declare assignments, either directly to a user or to a collection of users and/or groups.

Yea ,in group suppose there are two users and , and group  used in assignments, first user opened the task ,secnd user also opened the task ..... (Except default behaviour of appian) i dnt want secnd user should able to open the task till first user has closed

There's no way to do exactly this.  Appian handles task acceptance automatically - 2 users can't both accept the task, though both users would be able to *open* an *unaccepted* task and there's nothing to prevent them from doing this.

There's no way to do exactly this.  Appian handles task acceptance automatically - 2 users can't both accept the task, though both users would be able to *open* an *unaccepted* task and there's nothing to prevent them from doing this.