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copied!<p>Just to add some more information.</p> <p>In a Delphi project, code is organised into units. Each unit is a file with a name and a .pas extention.</p> <p>The unit has the following form:</p> <pre><code>unit Name; interface uses // The definition of these units can be used both in the // interface as in the implementation section. unit1, unit2; // Public interface, visible to other units that use this unit. implementation uses // The definition of these units can be used only in the // implementation section. unit3, unit4; // Private implementation, not visible outside. initialization // code to initialize the unit, run only once finalization // code to cleanup the unit, run only once end. </code></pre> <p>A unit can use anything defined in the unit as long as it is defined before it is beïng used.</p> <p>Sometimes this leads to confusing situations if names are identical:</p> <pre><code>unit1; interface type TTest = Integer; // ... unit2; interface type TTest = Boolean; // ... unit3; interface uses unit1, unit2; var a: TTest; // Which TTest? // ... </code></pre> <p>You can solve this by either knowing the evaluation order, or use a unit prefix:</p> <pre><code>unit3; interface uses unit1, unit2; var a: unit1.TTest; // TTest from unit1 b: unit2.TTest; // TTest from unit2 // ... </code></pre> <p>In your case, you need to use the unit in which Form2 is defined. </p> <p>If the timer is needed by both forms, you can also use a datamodule (just like a form, you can drag nonvisible components to it but they won't be visible). Both forms then can use the datamodule.</p> <p><strong>Edit</strong></p> <p>You try to use:</p> <pre><code>procedure Slide(Form: TForm; Show: Boolean); </code></pre> <p>And TForm has no Timer1.</p> <p>You can do the following:</p> <pre><code>procedure Slide(Form: TForm2; Show: Boolean); </code></pre> <p>If TForm2 is the form containing the Timer.</p>

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