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| Checks which key is pressed. |
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| Checks the signature of a duplicate. |
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| Checks the existence of a query. |
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| Checks the correspondence between a signature and a string. |
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| Checks whether a service is installed. |
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| Checks the status of a Facebook session. |
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| Checks the existence of a chart in memory. |
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| Checks the validity of an email address. |
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| Checks the status of a Facebook session. |
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| Checks the existence of a memory zone. |
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| Checks the existence of an external file. |
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| Checks the validity of a window handle. |
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| Checks the existence of a chart in memory. |
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| Checks the validity of a JSON string. |
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| Checks if a socket already exists. |
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| Checks the existence of a file on an FTP server. |
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| Checks the existence of a shared memory zone. |
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