To install
Metatrader Client Terminal, you have to download and launch it. Just follow the Installation Wizard to complete this task.
Terminal can be reinstalled over the existing version that will keep all the settings, except default profile or template and MQL programs.
If you open several accounts, install them in different directories. This way each account has its unique settings while all the accounts together have common registration details and language of the interface.
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Metatrader Forex Guide