The function registry-key-exists-p checks whether the registry key named subkey can be opened under the parent key root with the supplied access permissions.
subkey and root are interpreted as described for create-registry-key. The default value of root is :user.
If access is :read, then it opens the key with KEY_READ permissions. If access is :write, then it opens the key with KEY_WRITE permissions. If access is an integer, then the value access specifies the desired Win32 access rights. If access is omitted and root is :user, then registry-key-exists-p uses KEY_ALL_ACCESS. Otherwise it uses KEY_READ.
registry-key-exists-p closes the key before returning, but the return value is t if the key could actually be opened and nil otherwise.
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