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| Reference Information |
| These reference pages include useful information about 4th Dimension: |
| Limits for 4D | Valid ranges for 4D values. |
| HTML & ASCII Values | A complete listing of HTML and ASCII values. |
| Hexadecimal Converters | Hexadecimal to decimal and hexadecimal to RGB converters. |
| Error Code Lookup | Look up error numbers for any 4D product. |
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| Limits for 4D v11 |
| Database Structure |
| Data file |
Unlimited (no segmentation) |
| Tables |
32,767 (1 billion records per table) |
| Fields |
32,767 per table |
| Forms |
32,000 |
| Methods (project, form, object, and database) |
32,000 (up to 2Gb per method) |
| Lists |
8,000 items per list |
| Passwords |
16,000 users/16,000 groups (can be created by the designer and by the administrator) |
| Sets and Named Selections |
Unlimited |
| Processes |
32,767 simultaneous |
| Semaphores |
2 billion |
| Level of transactions |
Unlimited |
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| Variable & Field Types |
| Date |
1/1/100 to 12/31/32,767 |
| Time |
00:00:00 to 596,000:00:00 |
| Blob |
2Gb |
| Text |
2Gb of text |
| Longint |
-2^31 to (2^31)-1 |
| Integer 64 bits |
-2^63..(2^63)-1 |
| Float |
Floating point number |
| Real numbers |
±1.7e±308 (15 digits) |
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| Names |
| Variables |
31* |
| Tables |
31 |
| Fields |
31 |
| Methods |
31 |
| Forms |
31 |
| Plug-in Routines |
31 |
| Sets |
80 |
| Named Selections |
80 |
| Processes |
31 |
| Menu titles |
15 |
| Menu items |
31 |
| Menu names |
31 |
| List items |
255 |
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* not including "$" or "<>" |
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| Reserved Resource ID Ranges |
| Operating System |
-32,768 to -1 |
| Internal to 4D |
0 to 14,999 |
| 4D Developers |
15,000 to 32,767 |
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| Misc. |
| Method size |
32K |
| Menu bars |
255 characters |
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| Reserved 4D Variable Names |
| Document |
Error |
| FldDelimit |
RecDelimit |
| KeyCode |
OK |
| Modifiers |
MouseDown |
| MouseProc |
MouseX |
| MouseY |
OKGS (obsolete) |
| C1, C2, C3, C4, etc. |
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