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For instance, if 0127 your memos must satisfy some local requirements, such as a 0128 standard header for each page, then you could create a new class 0129 <code>smcmemo.cls</code> and begin your documents with 0130 <code>\documentclass{smcmemo}</code>. 0131 </p> 0132 <p>What separates a package from a document class is that the commands in a 0133 package are useful across classes while those in a document class are 0134 specific to that class. Thus, a command to set page headers is for a 0135 package while a command to make the page headers say <code>Memo from the 0136 SMC Math Department</code> is for a class. 0137 <a name="index-class-and-package-difference"></a> 0138 <a name="index-difference-between-class-and-package"></a> 0139 </p> 0140 <p>Inside of a class or package file you can use the at-sign <code>@</code> as a 0141 character in command names without having to surround the code 0142 containing that command with <code>\makeatletter</code> and 0143 <code>\makeatother</code>. See <a href="_005cmakeatletter-_0026-_005cmakeatother.html#g_t_005cmakeatletter-_0026-_005cmakeatother">\makeatletter & \makeatother</a>. This allow 0144 you to create commands that users will not accidentally redefine. 0145 Another technique is to preface class- or package-specific commands with 0146 some string to prevent your class or package from interfering with 0147 others. For instance, the class <code>smcmemo</code> might have commands 0148 <code>\smc@tolist</code>, <code>\smc@fromlist</code>, etc. 0149 </p> 0150 0151 <table class="menu" border="0" cellspacing="0"> 0152 <tr><td align="left" valign="top">• <a href="Class-and-package-structure.html#Class-and-package-structure" accesskey="1">Class and package structure</a>:</td><td> </td><td align="left" valign="top">Layout of the file. 0153 </td></tr> 0154 <tr><td align="left" valign="top">• <a href="Class-and-package-commands.html#Class-and-package-commands" accesskey="2">Class and package commands</a>:</td><td> </td><td align="left" valign="top">List of commands. 0155 </td></tr> 0156 </table> 0157 0158 0159 0160 0161 <hr/><div class='referenceinfo'> <a href='https://latexref.xyz/'> <i>Unofficial LaTeX2e reference manual</i></a></div> 0162 </body> 0163 </html>