The program keep a 64 bit "update" flag of the modification that affect it. For example, if you resize a window, the resizing operation will set the bit "UPDATE_WINDOW" in the flag, if the current TAG value has changed, the bit "UPDATE_CUR_TAG" will be set. A complete list of these flags can be found in the file "flag_update.hpp".
If one of these changes affect your module, you need to know about it when it happens.
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Update_Register
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This function is used to ask sliceOmatic to let you know of the changes. The program will call your function "Update_A()" and "Update_B()" when one of the update condition you registered for occurs.
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Update_A
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This function is called as soon as the changes are detected (one per loop).
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Update_B
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This function will only be called when more immediate operations have been done (once all current redraw demand have been met). This is used to update non-essential part of the interface. For example, the "Blow-up" tool register the flag "UPDATE_CURSOR" to know when the cursor is moved, but only re-draw the blow-up window in the "Update_B" function.
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