First defined in: FKiSS4
The
letframe action sets the value of
variable to the
current
group frame
number of
group.
If group has not been set to a frame, variable is set
to -1.
variable must a variable name.
group must a valid
group.
Example:
;@ letframe(VarFrame, !MyGroup) ; Sets the variable VarFrame to the current frame of !MyGroup