Again, what InGroup() returns depends on KiX version.

From the 3.62 manual:
0 The user is not a member of a group with this name.
1 The user is a member of a global group with this name.
2 The user is a member of a local group with this name.
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Give a man a fish and he will be back for more. Slap him with a fish and he will go away forever.