a) A custom object is any GUI object not belonging to one of the standard classes used by WinRunner. WinRunner learns such objects under the generic “object” class. WinRunner records operations on custom objects using obj_mouse_ statements.
b) If a custom object is similar to a standard object, you can map it to one of the standard classes. You can also configure the properties WinRunner uses to identify a custom object during Context Sensitive testing.

[Source: JAGAN MOHAN "Interview questions bible"]

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