David Allen, author of Getting Things Done approach recommends:
If the Next Action can be done in 2 minutes or less, do it when you first pick the item up. Even if that item is not a "high priority", because it takes longer to store and track any item than to deal with it the first time its in your head. - David Allen, Getting Things Done, p.191
Generally, this rule means: if some task can be done in less than two minutes, do it now.
Productivity Scientific GTD Timer starts with predefined time of two minutes by default and you can start countdown with one keystroke. Of course this does not mean that you can countdown only for two minutes - any reasonable time period may be used from seconds to hours.
Time budgeting is a very popular time management technique, because time likes counting like money does. And even more, because you can get more money but you can't get more time - all people get the same amount of time each day - only 24 hours. That's why it is incredibly important to set a time budget for certain activities similar to process of setting money budget before making purchases.
GTD Timer helps to set time budget by limiting amount of time that you are planning to spend for a particular activity. Before starting anything, ask yourself how much time you are willing to invest in that activity. Launch GTD Timer with planned amount of time and stick to your time budget.
GTD Timer can be used to display amount of time which is left before completion of some activity. You can use it as auction timer, presentation timer, kithen timer, display time left for rest break or working day. You can set time period to countdown or enter time when the activity ends using "T" prefix (see).
GTD Timer is very suitable as personal reminder. When starting timer you may enter message to yourself and this message will pop-up when timer will finish coundown. You may start any number of timers simultaneously (available in registered version) with different reminders.
Using presets and commands you can automate reminders. For example, you can create reminder preset which opens e-mail client and use it when you create reminder to send letter for anybody (with "mailto" command). Using "net send" command you can create reminder which sends message for other people in local network.
Using presets with commands GTD Timer is exceptionally suitable to use as scheduler to run commands at a specified time. For example, you can create preset to shutdown a computer after some task finishes (as described in documentation).
You can use virtually any command: launch programs, run batch files or single commands and so on.
Many online services place users to waiting queue for some amount of time. For example, RapidShare file sharing service allows unlimited downloads only with RapidShare Premium Accounts, but if you use free account you have to wait for some amount of time between downloads. It is annoying to remember


Timer's window shown with Tray Icon and Context Menu



When starting GTD Timer opens Start Timer window (see in the picture below).

Use this window to setup parameters for the timer. To navigate between controls use Tab key. If you want to skip this window, click Cancel button or press Esc key on the keyboard. To close the program click Close button in the top-right corner of the window or press Alt-F4 key on the keyboard. After entering parameters press one of the buttons at the bottom of the window.
Parameters:
Buttons:
If checkbox "Show this window on startup" is checked then this window appears when GTD Timer started, otherwise you can open this window using button on timer's window or via popup menu accessible from timer's icon.
To open timer configuration dialog call Settings menu item from GTD Timer Tray Icon context menu (do right mouse click on timer's icon to open the menu).
General settings tab is shown in the picture below.

This tab allows to specify general parameters for the program:
Preset settings tab is shown in the picture below.

GTD Timer allows to create presets that include Tray Icon parameters, sound played and command run when countdown finishes.
Use this window to create, delete, rename, reorder presets or open Setup Preset dialog. Follow this link to learn more about presets and how to setup them.
Select checkbox Auto-select next preset after opening new window to allow GTD Timer automatically select next preset when opening time select window.
GTD Timer allows to create presets - sets of parameters used to easily distinguish multiple running copies of the timer or to run different actions when countdown finishes.
Presets include:
To access presets configuration open Presets tab in Settings dialog (Settings dialog accessible via Tray Icon context menu item Settings).
Presets tab is shown in the picture below.

Use this window to add, remove, rename, reorder presets, access Setup Preset dialog, reset list of presets to default if required.
The checkbox Auto-select next preset after opening new window used to automatically select next preset in time selection dialog when multiple copies of the software running.
To access preset configuration dialog press Setup Preset... button.
Setup Preset dialog appears (shown in the picture below).
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Use Preset Caption field to name preset, recommended to use such name that helps to easily distinguish deferent presets (for example, name can include list of preset settings)
Use Tray Icon Color tab to choose Tray Icon text color and background color or set background transparent by checking Transparent background checkbox.
Tab Sound is shown in the picture below.

Use this tab to configure sound played when timer countdown finishes.
Options:
Action tab is shown in the picture below.

Use this tab to run action when timer countdown finishes or choose No action option to disable actions.
If you wish to run action choose Command line option and fill required field Command and optional field Parameters.
Actions run using operating system ShellExecute function.
Examples of actions:
Use the shortcuts to manipulate GTD Timer from the keyboard
While using main window shortcuts be sure that main window has input focus (do mouse click on timer's window, icon for example).

List of shortcuts:

List of shortcuts:
GTD Timer timer can be run from command line. You can create one or multiple shortcuts to the software executable (gtdtimer.exe) and pass parameters to it. Alternatively you can start timer from batch files.
Remember to precede executable file name with full path where the software was installed or add the path to the system environment PATH variable.
Usage:
gtdtimer.exe /T=MM:SS [/M="Message Text"] [/P=Profile number]
Parameters:
Examples:
GTD Timer can be used in two modes: as a free version and as a registered commercial version.
Free version of GTD Timer is available only for personal use and only on "Home" versions of Microsoft Windows. Also free version has following limitations in functionality: 1) no multiple running copies allowed; 2) no preset choosing allowed; 3) necessity to see nagging screen.
To use full non-limited in functionality version of GTD Timer a license must be purchased and software should be registered. Additional benefit of purchased version is ability to use official support from Productivity Scientific company.
For evaluation purposes all features of the software can be used for free within the time-limited trial period of 30 days, but at the end of this period if you are not eligible for free version you must either purchase a license for the program or uninstall it.
You can purchase a license from ordering page of this website. Please note that the actual purchase transaction is performed by our partners - registration services that are well-known and secure companies. The Productivity Scientific company does not have access to your financial information (like a credit card number, etc.) during the entire process and after the transaction.
While obtaining the license, you should provide your full name and e-mail address. For security reasons the Productivity Scientific company will send your serial number only to the provided e-mail address.
Serial numbers for all our software delivered immediately after end of the purchase transaction. You can use registered version of the software just few minutes after starting the transaction.
To register the program you have to enter your full name, e-mail address and serial number to the corresponding fields on the Registration tab of the Settings dialog box.
The Registration tab is shown in the picture below.
