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#### 10.8.3 Important informations about remote repositories

At least CVS can be used in a mode called “Client/Server” which means the root repository is located on a remote machine. We call a repository which can not being mounted by the client-machine (which contains the working directory) a remote repository. In most cases getting the fresh and real VC-state for such repositories will be unacceptable slow or often users will work offline means with no connection available to the remote host. To avoid problems like these ECB offers first an option `ecb-vc-directory-exclude-regexps` to exclude such directories with a remote repository from the VC-support of ECB and secondary the identify-backend-funtion `ecb-vc-dir-managed-by-CVS` behaves smart with that respect (see Identifying backends). See also `ecb-vc-xemacs-exclude-remote-cvs-repository`!

#### 10.8.3.1 Remote paths and the VC-support of ECB

ECB supports working with remote directories like TRAMP- or EFS-directories (see Remote directories). Do not confuse remote directories with remote repositories. A local directory located on your disk and set in `ecb-source-path` can have a remote repository if managed by a VC-system. A remote directory means a path in the format of TRAMP, ANGE-FTP or EFS set in `ecb-source-path`. Its very likely that getting the VC-state of files contained in such a remote directory would be extremly expensive and therefore ECB would be blocked quite long even if the VC-check is performed stealthy (see Stealthy background tasks).

To avoid problems with such remote directories ECB prevents per default such directories from being processed by the VC-support of ECB. But if a user is dying to having the VC-state being displayed in the tree-buffers ECB offers two ways to switch on the VC-support - see the option `ecb-vc-enable-support`: This option is set per default to the value `unless-remote` which means remote paths will not be processed but it can be set to `t` which means process all directories regardless if remote or not. It’s strongly recommended to use `unless-remote`!

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