Sessions & Tracks : Tracks : Making Tracks Inactive

Making Tracks Inactive
Audio, Auxiliary Input, Master Fader, VCA Master (Pro Tools HD and Pro Tools with Complete Production Toolkit only), and Instrument tracks can be made inactive. Inactive tracks use no DSP or voices. Plug-Ins, sends, voices, and automation on inactive tracks are all disabled. Tracks may also be automatically made inactive if a session is opened on a system with less DSP power than the system that it was created on.
To toggle a track active/inactive:
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Command-Control-click (Mac) or Control-Start-click (Windows) the Track Type indicator in the Mix window.
Playlists for inactive tracks are dimmed and track controls are grayed out.
To make one or more tracks inactive or active, do one of the following:
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Select the track and select Track > Make Inactive/Active.
– or – 
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Right-click the Track Name in the Track List, or Mix or Edit windows and choose Make Inactive/Active.
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To select multiple tracks, Command-click (Mac) or Control-click (Windows) additional Track Names.
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To select a range of tracks, Shift-click the Track Names bounding the range of tracks you want selected.