be TRUE if transient_for != NULL, but not guaranteed to be FALSE if
transient_for == NULL. */
gboolean transient;
- /*! The client which this client is a transient (child) for */
+ /*! The client which this client is a transient (child) for.
+ A value of TRAN_GROUP signifies that the window is a transient for all
+ members of its Group, and is not a valid pointer to be followed in this
+ case.
+ */
struct Client *transient_for;
/*! The clients which are transients (children) of this client */
GSList *transients;