a) You can create a bitmap synchronization point that waits for the bitmap of an object or a window to appear in the application being tested.
b) During a test run, WinRunner suspends test execution until the specified bitmap is redrawn, and then compares the current bitmap with the expected one captured earlier. If the bitmaps match, then WinRunner continues the test.
obj_wait_bitmap ( object, image, time );
win_wait_bitmap ( window, image, time );

[Source: JAGAN MOHAN "Interview questions bible"]

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