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If there is no entry that has the name of the mouse followed by <sys>[XExtensionPointer]</sys>, then the mouse was not recognized by your computer. If the entry exists, your mouse was recognized by your computer. In this case you should check that the mouse is <link xref="#plugged-in">plugged</link> in and in <link xref="#broken">working condition</link>.
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If there is no entry that has the name of the mouse followed by <sys>[XExtensionPointer]</sys>, then the mouse was not recognized by your computer. If the entry exists, your mouse was recognized by your computer. In this case you should check that the mouse is <link xref="#plugged-in">plugged in</link> and in <link xref="#broken">working condition</link>.
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If your mouse has a serial (RS-232) connector, you may need to perform some
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extra steps to get it working. The steps might depend on the make or model of