34.44. Method: isNvreInstalled
Check if the package with the given NVRE is installed on given system.
The following parameters are available for this method:
- string
sessionKey - int
serverId - string
name- Package name - string
version- Package version - string
release- Package release
The following return values are available for this method:
1if package exists,0if not, and an exception is thrown if an error occurs

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